At the A1 level, the word 'simultaneously' might seem very long and difficult, but the idea behind it is very simple. It means 'at the same time.' Imagine you are eating an apple and watching a movie. You are doing both things at the same time. You can say, 'I am eating and watching TV simultaneously.' However, at this level, it is much more common to use the phrase 'at the same time.' You might hear a teacher say, 'Please don't all speak at the same time.' If they want to use a big word, they might say 'simultaneously.' It is a word that helps you describe when two things happen in the same moment. For example, if two friends knock on your door at the exact same second, they knocked simultaneously. It is a good word to know because it makes your English sound more advanced, even if you only use it once in a while. Think of it as a special word for 'together in time.' You can practice by looking for things that happen together, like a bird singing while a car drives by. They are happening simultaneously! Don't worry about the long spelling yet; just focus on the meaning: two things, one moment.
For A2 learners, 'simultaneously' is a useful addition to your vocabulary for describing daily routines and simple actions. It is an adverb, which means it tells us *how* or *when* an action happens. You use it when you want to be more precise than just saying 'and.' For example, instead of saying 'I listen to music and I clean my room,' you can say 'I listen to music while simultaneously cleaning my room.' This shows that the two actions are overlapping. It is common in instructions. A computer might tell you, 'Downloading and installing simultaneously.' This means it is doing both jobs at once. You might also see it in stories. 'The hero jumped, and simultaneously, the bomb exploded.' This makes the story feel more exciting because everything is happening at once. A good way to remember it is to think of 'simultaneous' as 'same-time-ous.' It's a formal word, so you might hear it in news reports or from your boss at work. If you can use this word correctly, it shows that you are moving beyond basic English and starting to use more professional language. Try using it when you talk about your hobbies or your work day to describe how you manage your time.
At the B1 level, you are expected to understand and use 'simultaneously' in a variety of contexts, especially in professional and academic settings. This word is a key part of describing complex processes and multitasking. It allows you to move away from simple chronological 'first this, then that' structures and describe parallel events. For instance, in a business presentation, you might say, 'We are launching the new website while simultaneously starting our social media campaign.' This sounds much more professional than saying 'at the same time.' You should also be aware of its placement in a sentence. It often comes at the end of a clause or right after the verb. You might also encounter it when people talk about their feelings. 'I felt simultaneously relieved and worried when I heard the news.' This describes a complex emotional state where two different feelings exist together. At this level, you should also start to distinguish 'simultaneously' from similar words like 'concurrently.' While they are often used as synonyms, 'simultaneously' usually refers to the exact same moment, while 'concurrently' can refer to a longer period of time. Using 'simultaneously' correctly will help you in writing essays, participating in meetings, and describing more detailed situations in your daily life.
By the B2 level, you should be comfortable using 'simultaneously' to describe sophisticated concepts in science, technology, and literature. You understand that this word is not just about timing, but often about the coordination of complex systems. In a technical report, you might describe how a machine performs multiple functions simultaneously to increase productivity. In a literary analysis, you might discuss how an author uses simultaneous plotlines to create a sense of a larger, interconnected world. You should also be able to use the word to describe abstract ideas. For example, 'The government is trying to reduce the deficit while simultaneously increasing spending on infrastructure.' This highlights a difficult balancing act. You are also likely to encounter the adjective form, 'simultaneous,' as in 'a simultaneous translation' or 'a simultaneous broadcast.' At this level, you should be careful to avoid redundancy, such as saying 'simultaneously at the same time.' Your use of the word should be precise and purposeful. You might also use it to contrast with 'sequentially' or 'consecutively' to clarify the order of events in a complex process. Mastering 'simultaneously' at this level means you can handle the nuances of formal English and communicate complex temporal relationships with ease.
At the C1 level, 'simultaneously' is a tool for high-level analysis and precise communication. You use it to describe the intricate workings of systems, whether they are biological, mechanical, or social. For example, you might discuss how the human brain processes visual and auditory information simultaneously to create a unified perception of the world. In a political science context, you could analyze how a country manages simultaneous crises in its economy and its foreign relations. You are also aware of the word's role in creating specific rhetorical effects. Using 'simultaneously' can emphasize the intensity or the overwhelming nature of a situation. You might describe a 'simultaneous assault on the senses' in a piece of modern art. At this level, you should also be familiar with related terms like 'synchronicity' and 'concurrency' and know when to use each for maximum precision. You understand that 'simultaneously' can also be used to describe the coexistence of contradictory qualities in a way that highlights paradox or complexity. For instance, 'The policy was simultaneously hailed as a breakthrough and condemned as a betrayal.' Your command of the word allows you to navigate the most demanding academic and professional environments, where the ability to describe overlapping and complex events is essential for clear and effective communication.
For C2 speakers, 'simultaneously' is a fundamental part of a highly nuanced and precise vocabulary. You use it to explore the deepest complexities of time, logic, and existence. In philosophical or scientific discourse, you might discuss the 'relativity of simultaneity,' a concept from physics which states that whether two events happen at the same time depends on the observer's frame of reference. This level of usage goes far beyond simple timing and enters the realm of theoretical analysis. You might also use the word to describe the multi-layered nature of consciousness or the intricate web of global events. For example, 'The rise of digital technology has simultaneously democratized information and created new avenues for surveillance and control.' This sentence uses the word to frame a complex, dual-natured reality. You are also adept at using the word in creative writing to manipulate the reader's perception of time and space. You might describe a scene where the past and the present seem to exist simultaneously in a character's mind. At this level, your use of 'simultaneously' is always deliberate, contributing to a sophisticated and elegant style. You understand the word's etymological roots and its place within the broader landscape of English adverbs, using it to provide clarity, depth, and precision to even the most abstract and challenging topics.

simultaneously in 30 Seconds

  • Simultaneously is an adverb that means two or more things are happening at the exact same time, emphasizing synchronization and parallel events.
  • It is a formal alternative to 'at the same time' and is commonly used in technical, academic, and professional English contexts.
  • The word is often used to describe multitasking, coordinated efforts, or the coexistence of different emotions and states of being.
  • Correct usage involves placing it after the verb or at the end of a clause to clarify that actions are overlapping perfectly.

The word simultaneously is a sophisticated adverb that functions as a temporal bridge, connecting two or more actions that occur within the exact same window of time. While a beginner might simply say 'at the same time,' the word simultaneously adds a layer of precision and formal elegance to the description. It is derived from the Latin word 'simul,' which translates to 'together' or 'at once.' When you use this word, you are emphasizing the synchronization of events, suggesting that there is no delay or gap between them. It is frequently employed in technical, academic, and professional contexts where the timing of processes is critical. For instance, in the world of computing, a processor might perform millions of calculations simultaneously to ensure a smooth user experience. In the world of music, a conductor ensures that the violinists and the cellists begin their notes simultaneously to create a harmonious sound. Beyond the technical, we use it in our daily lives to describe the complexities of multitasking. Imagine trying to listen to a podcast while cooking dinner; you are engaging in both activities simultaneously. This word is essential for anyone looking to describe complex systems, coordinated efforts, or the simple reality of a busy modern life where multiple things are always happening at once.

Temporal Synchronization
The primary function of the word is to denote that the start, duration, or end of multiple events coincide perfectly in time.

The software was designed to update the database and notify the users simultaneously, ensuring that no one was left with outdated information.

In professional settings, the word is often used to describe efficiency. A company might launch a product in five different countries simultaneously to maximize global impact and prevent regional spoilers. In scientific research, researchers might observe how different variables change simultaneously during an experiment to find correlations. The word carries a sense of 'all at once' but with a more controlled and deliberate connotation. It suggests a level of organization or a natural occurrence that is noteworthy because of its timing. When you hear this word in a news report, it often refers to coordinated attacks, simultaneous protests in different cities, or economic shifts happening across various sectors at the same time. It is a word that demands attention to the 'when' of a situation, highlighting that the timing is not accidental but a key feature of the event itself.

Multi-tasking and Parallelism
In modern discourse, it frequently describes the human ability or the technological capacity to handle multiple streams of information or tasks in parallel.

She was able to translate the speech simultaneously as the diplomat spoke, showing incredible mental agility.

Furthermore, the word can be used to describe conflicting emotions or states of being. A person might feel simultaneously happy and sad during a graduation ceremony—happy for the achievement but sad to leave friends behind. This usage highlights the complexity of the human experience, where different feelings can occupy the same space and time without canceling each other out. In literature, authors use the word to build tension or to show the breadth of a scene, describing what is happening in the castle while simultaneously describing the approach of the army in the valley. This dual-focus narrative technique relies on the reader's understanding that these events are unfolding in the same heartbeat of the story's timeline.

Coincidence and Chance
While often implying coordination, it can also describe random events that happen to occur at the same moment by sheer luck or fate.

The two phones rang simultaneously, startling everyone in the quiet office.

In summary, simultaneously is a versatile and powerful word. It allows us to group events together, to show the complexity of systems, and to express the multifaceted nature of our thoughts and feelings. Whether you are talking about a computer processor, a symphony orchestra, or your own busy schedule, this word provides the linguistic precision needed to describe the overlapping nature of time. It is a hallmark of clear, professional communication and a vital tool for anyone looking to master the nuances of the English language. By using it correctly, you demonstrate an understanding of temporal relationships and a command of formal vocabulary that will serve you well in any academic or professional endeavor.

The dancers moved simultaneously, creating a perfect mirror image of each other on the stage.

The fireworks exploded simultaneously across the city skyline to celebrate the new year.

Using the word simultaneously correctly requires an understanding of its placement within a sentence and the context of the actions being described. As an adverb, its primary role is to modify verbs, adjectives, or even entire clauses. The most common placement is after the verb it modifies or at the end of the sentence. For example, 'They shouted simultaneously.' However, it can also be placed between the auxiliary verb and the main verb: 'They were simultaneously shouting.' This flexibility allows you to emphasize the timing in different ways depending on the rhythm of your sentence. It is important to ensure that there are at least two distinct actions or subjects involved, as the word inherently implies a relationship between multiple things happening at once. If you only have one action, the word 'simultaneously' would not make sense.

Placement After the Verb
This is the most direct way to use the word, focusing the reader's attention on the action itself.

The two runners crossed the finish line simultaneously, resulting in a rare dead heat.

When dealing with more complex sentences, 'simultaneously' can be used to link two different clauses. In this case, it often appears at the beginning of the second clause, sometimes preceded by 'while' or 'and.' For example, 'The orchestra began to play, and simultaneously, the lights dimmed.' This creates a cinematic effect, showing the reader two different parts of a scene unfolding at once. It is also common in technical writing to describe parallel processes. You might read, 'The system backs up the data while simultaneously scanning for viruses.' Here, the word clarifies that the backup and the scan are not happening one after the other, but are sharing the system's resources at the same time. This is a crucial distinction in fields like engineering, computer science, and project management.

Linking Two Clauses
Using the word to connect different parts of a sentence helps to build a comprehensive picture of a single moment in time.

The chef was chopping vegetables; simultaneously, the water in the pot began to boil.

Another sophisticated use of 'simultaneously' is to describe the coexistence of qualities or states. This is often seen in character descriptions or philosophical discussions. For instance, 'The novel is simultaneously a thrilling mystery and a deep meditation on grief.' This usage tells the reader that the book doesn't switch between being a mystery and a meditation, but rather holds both identities at every moment. It is a powerful way to describe complexity without using too many words. Similarly, you might say a person is 'simultaneously terrified and exhilarated' when skydiving. The word highlights the tension between these two powerful emotions, showing that they are intertwined and occurring in the same instant of experience.

Coexisting States
This usage allows for the description of complex, multi-layered realities or emotions that occur at once.

The movie was simultaneously hilarious and heartbreaking, leaving the audience in tears of both joy and sorrow.

Finally, it is worth noting that 'simultaneously' is almost always used in its adverbial form. While the adjective 'simultaneous' exists (e.g., 'a simultaneous broadcast'), the adverb is much more common in everyday speech and writing. When you are describing *how* something happens in relation to time, 'simultaneously' is your go-to word. It provides a level of clarity that is essential for effective communication, especially when the sequence of events is a critical part of the message you are trying to convey. By mastering its use, you can move beyond simple chronological storytelling and begin to describe the rich, overlapping tapestry of events that make up our world.

The alarm went off simultaneously in every room of the building, signaling an immediate evacuation.

The researchers monitored the heart rate and brain activity simultaneously during the sleep study.

You will encounter the word simultaneously in a wide variety of settings, ranging from high-stakes news broadcasts to technical manuals and artistic critiques. In the world of news and current events, journalists use it to describe coordinated actions. You might hear a news anchor say, 'Protests erupted simultaneously in over fifty cities across the globe today.' This usage emphasizes the scale and the organized nature of the event. It suggests that the timing was not a coincidence but a deliberate choice by the organizers to create a massive, unified impact. Similarly, in reporting on military or police operations, you might hear about 'simultaneous raids' conducted to prevent suspects from alerting one another. In these contexts, the word conveys a sense of urgency, precision, and strategic planning.

News and Media
Used to describe large-scale, coordinated events or breaking news where multiple things are happening at once.

The three satellites were launched simultaneously from the same rocket, according to the space agency's report.

In the tech industry, 'simultaneously' is a buzzword for performance and efficiency. When a new smartphone is released, the marketing materials might boast about its ability to run multiple high-demand apps simultaneously without lagging. Software developers use the term when discussing 'simultaneous users'—the number of people who can be on a platform at the exact same time before the servers crash. In the gaming world, 'simultaneous multiplayer' refers to games where players act at the same time, rather than taking turns. If you are reading a manual for a new kitchen appliance, it might tell you that the oven can bake and broil simultaneously in different compartments. In all these technical cases, the word is a marker of advanced capability and modern convenience.

Technology and Engineering
A key term for describing parallel processing, multi-user environments, and high-performance hardware.

The new processor can handle billions of instructions simultaneously, making it the fastest on the market.

The arts and humanities also make frequent use of the word. Music critics might describe a complex piece of jazz where several musicians are improvising simultaneously, creating a dense but beautiful texture. In film studies, 'simultaneous action' refers to the technique of cross-cutting between two different scenes to show they are happening at the same time, building suspense for the moment they eventually meet. Literary critics use the word to describe 'simultaneous narratives' in a novel, where the story is told from different perspectives at once. Even in sports, commentators use it to describe a 'simultaneous hit' in boxing or a 'simultaneous touch' of the wall in a swimming race. In these fields, the word helps to describe the beauty, tension, or competitive nature of overlapping events.

Arts and Sports
Used to analyze complex compositions, narrative structures, and close competitive finishes.

The two swimmers touched the wall simultaneously, sharing the gold medal in a historic finish.

Finally, you will hear 'simultaneously' in everyday professional conversations, especially when discussing project timelines or personal productivity. A manager might ask if a team can handle two projects simultaneously, or a colleague might complain about having to listen to a meeting while simultaneously answering urgent emails. It has become a standard part of the vocabulary of the modern workplace, where 'doing more with less' often means doing multiple things at once. Whether it's in a formal report, a technical discussion, or a casual office chat, 'simultaneously' is the word of choice for describing the synchronized, parallel, and often chaotic nature of our time-pressed lives.

The company announced the merger simultaneously in London and New York to avoid market speculation.

During the festival, several bands performed simultaneously on different stages throughout the park.

One of the most common mistakes learners make with simultaneously is confusing it with words that sound similar but have very different meanings. The most frequent culprit is 'spontaneously.' While 'simultaneously' refers to *when* things happen (at the same time), 'spontaneously' refers to *how* something happens (without planning or external cause). For example, if two people start laughing at the same time, they are laughing simultaneously. If one person suddenly starts laughing for no apparent reason, they are laughing spontaneously. Confusing these two can lead to significant misunderstandings, especially in scientific or technical contexts where the distinction between timing and causality is vital. Always remember: 'simul' is about 'same time,' while 'spont' is about 'sudden impulse.'

Simultaneously vs. Spontaneously
Simultaneously means 'at the same time.' Spontaneously means 'suddenly and without planning.'

Incorrect: The two chemicals reacted spontaneously at exactly 5:00 PM. (Unless you mean they reacted without a catalyst, you likely mean simultaneously.)

Another common error involves the misuse of 'simultaneously' when 'sequentially' or 'consecutively' is intended. These words are opposites. 'Sequentially' means one after another in a specific order, while 'simultaneously' means all at once. In a recipe, you might need to add ingredients sequentially (first the flour, then the eggs). If you add them simultaneously, you might end up with a lumpy mess. In business, tasks are often performed sequentially to ensure quality control. Using 'simultaneously' when you mean 'one after another' can cause confusion in project planning and instructions. It is also important to distinguish it from 'concurrently.' While they are very similar, 'concurrently' often refers to things happening during the same time *period* (like two laws being in effect), whereas 'simultaneously' usually refers to the exact same *moment*.

Simultaneously vs. Sequentially
Simultaneously means 'all at once.' Sequentially means 'one after the other.'

Correct: The runners started the race simultaneously, but they finished sequentially as they reached the end one by one.

A stylistic mistake is the 'redundancy error.' People often say 'simultaneously at the same time.' Since 'simultaneously' *means* 'at the same time,' using both is repetitive and considered poor writing. It's like saying 'the blue-colored blue sky.' To improve your writing, choose one or the other. 'Simultaneously' is better for formal writing, while 'at the same time' is perfectly fine for casual conversation. Additionally, some learners struggle with the spelling, often forgetting the 'u' or the double 'l' in related words like 'simultaneity.' Breaking the word down into 'simul-tane-ous-ly' can help with both pronunciation and spelling. Remember that the 'tane' part sounds like 'tain' in 'mountain' for some, but in 'simultaneously,' it's usually a quick 'tane' or 'tayn' sound.

Redundancy Check
Avoid saying 'simultaneously at the same time.' Pick one to keep your sentences concise.

Incorrect: They both spoke simultaneously at the same time. (Choose one: 'They both spoke simultaneously' OR 'They both spoke at the same time.')

Finally, be careful with the scope of the word. 'Simultaneously' implies a very tight temporal connection. If you say two people were born simultaneously, you are saying they were born at the exact same second. If they were born on the same day but hours apart, 'simultaneously' is inaccurate. In such cases, 'on the same day' or 'coincidentally' would be better. Precision is the strength of this word, so using it for events that are only roughly at the same time can make your writing seem hyperbolic or inaccurate. Use it when the 'at the same time' aspect is literal and important to the meaning of your sentence.

Correct: The lightning struck and the thunder crashed almost simultaneously, indicating the storm was very close.

The two computers were simultaneously infected by the same virus, suggesting a coordinated cyber attack.

While simultaneously is a fantastic word, having a variety of synonyms allows you to tailor your language to the specific context and avoid repetition. The most common alternative is the phrase 'at the same time.' This is versatile and works in almost any situation, though it lacks the formal weight of 'simultaneously.' For more formal or technical writing, 'concurrently' is an excellent choice. While 'simultaneously' often emphasizes the exact moment, 'concurrently' is frequently used for things happening during the same period of time. For example, a student might be taking two courses concurrently over a semester. They aren't sitting in both classes at the exact same second, but the classes are happening in the same timeframe.

Simultaneously vs. Concurrently
Simultaneously: Exact same moment. Concurrently: Same time period or parallel tracks.

The two projects are running concurrently, but their deadlines are staggered by a week.

Another technical synonym is 'synchronously.' This word is heavily used in computing and telecommunications. It implies not just happening at the same time, but happening in a coordinated way, often governed by a clock or a signal. For instance, 'synchronous communication' (like a phone call) happens in real-time, whereas 'asynchronous communication' (like email) does not. In a more poetic or literary context, you might use 'all at once' or 'in unison.' 'In unison' is particularly useful when describing people speaking or moving together, like a choir or a group of soldiers. It carries a connotation of harmony and perfect agreement that 'simultaneously' lacks.

Simultaneously vs. Synchronously
Simultaneously: General 'at the same time.' Synchronously: Coordinated or timed to happen together.

The dancers moved in unison, their feet hitting the floor at the exact same moment.

If you want to describe things that happen together by chance, 'coincidentally' is a good choice. It suggests that the timing was a surprise or a stroke of luck. For example, 'Coincidentally, we both arrived at the party wearing the same shirt.' Here, 'simultaneously' would only work if you both walked through the door at the exact same second. 'Together' is the simplest alternative, but it often implies physical proximity rather than just temporal coincidence. You can go to the store 'together' (with someone) or 'simultaneously' (at the same time as someone else, perhaps in different cars). Understanding these nuances helps you choose the word that fits your meaning perfectly.

Comparison Table
  • Simultaneously: Formal, precise, exact moment.
  • At the same time: Casual, versatile, general.
  • Concurrently: Professional, refers to time periods or parallel tasks.
  • Synchronously: Technical, implies coordination or a shared clock.
  • In unison: Artistic/Group focus, implies harmony.

The two events occurred coincidentally, but they had a profound impact on the town's history.

Finally, consider the word 'together.' While simple, it is often the most natural choice in conversation. 'We arrived together' is much more common than 'We arrived simultaneously.' Use 'simultaneously' when you want to highlight the timing as a specific point of interest or when you are writing in a context that requires a higher level of formality. By having all these options in your vocabulary 'toolbox,' you can express yourself with greater variety and precision, ensuring that your message is always clear and appropriate for your audience.

The bells of the city's churches rang out simultaneously to mark the end of the war.

The system is designed to handle multiple requests simultaneously without any loss of data integrity.

How Formal Is It?

Formal

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Neutral

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Informal

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Child friendly

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Slang

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Fun Fact

The root 'simul' is also the ancestor of the word 'similar.' This makes sense because things that happen at the same time are 'together,' and things that are similar are 'together' in their appearance or nature.

Pronunciation Guide

UK /ˌsɪm.əlˈteɪ.ni.əs.li/
US /ˌsaɪ.məlˈteɪ.ni.əs.li/
The primary stress is on the third syllable: sim-ul-TANE-ous-ly.
Rhymes With
spontaneously extraneously contemporaneously instantaneously miscellaneously subcutaneously gaseously hideously
Common Errors
  • Pronouncing it as 'sim-ul-tan-ous-ly' (missing the 'e' sound).
  • Putting the stress on the first syllable.
  • Confusing the 'simul' sound with 'smile'.
  • Missing the 'u' sound entirely.
  • Adding an extra 'ly' at the end.

Difficulty Rating

Reading 3/5

The word is long but its meaning is usually clear from the context of two things happening.

Writing 4/5

Spelling 'simultaneously' correctly can be a challenge for many learners.

Speaking 4/5

The pronunciation requires careful attention to the multi-syllabic structure.

Listening 3/5

It is a distinct-sounding word that is usually easy to pick out in a sentence.

What to Learn Next

Prerequisites

time same together moment happen

Learn Next

concurrently synchronously consecutively sequentially instantaneously

Advanced

synchronicity concurrency temporal coincidence parallelism

Grammar to Know

Adverb Placement

Simultaneously usually follows the verb (They spoke simultaneously) or comes at the end of the clause.

Using 'While' with Adverbs

You can use 'while simultaneously' to connect two continuous actions (He was singing while simultaneously dancing).

Adverbial Phrases

'At the same time' is the prepositional phrase equivalent of the adverb 'simultaneously'.

Passive Voice with Adverbs

In passive sentences, the adverb often comes after the auxiliary verb (The shows were simultaneously broadcast).

Comma Usage

If 'simultaneously' starts a sentence, it is often followed by a comma (Simultaneously, the two doors opened).

Examples by Level

1

I can eat and talk simultaneously.

I can eat and talk at the same time.

Adverb at the end of the sentence.

2

The two bells rang simultaneously.

The two bells rang at the same time.

Modifying the verb 'rang'.

3

They jumped into the pool simultaneously.

They jumped into the pool together at once.

Adverb modifying 'jumped'.

4

The lights went off simultaneously.

All the lights went off at the same time.

Focus on the timing of the action.

5

We both said 'hello' simultaneously.

We both said 'hello' at the same time.

Shows two people doing the same thing.

6

The dancers moved simultaneously.

The dancers moved at the same time.

Describes coordinated movement.

7

The two cars stopped simultaneously.

The two cars stopped at the same time.

Adverb after the verb.

8

Can you clap and sing simultaneously?

Can you clap and sing at the same time?

Used in a question about multitasking.

1

She was cooking and listening to the radio simultaneously.

She was doing two things at once.

Used with continuous verb forms.

2

The computer is scanning and cleaning simultaneously.

The computer does two jobs at the same time.

Technical context for A2.

3

The two runners reached the line simultaneously.

They finished the race at the same time.

Common sports context.

4

He felt happy and sad simultaneously.

He had two feelings at the same time.

Describing emotions.

5

The alarm rang in all rooms simultaneously.

The alarm went off everywhere at once.

Describes a widespread event.

6

The app updates your location and speed simultaneously.

The app does two things at the same time.

Describing app functionality.

7

They both started laughing simultaneously.

They began to laugh at the same moment.

Focus on the start of an action.

8

The doors opened simultaneously at the station.

All the train doors opened at once.

Describes a mechanical process.

1

The company launched the product in three countries simultaneously.

The launch happened in three places at once.

Business context for B1.

2

The software allows multiple users to edit the file simultaneously.

Many people can work on the file at once.

Describes collaboration technology.

3

The two events were broadcast simultaneously across the network.

The shows were on TV at the same time.

Passive voice with simultaneously.

4

She managed to work full-time while simultaneously studying for her degree.

She did two big things in her life at once.

Using 'while simultaneously' for emphasis.

5

The explosion caused several fires to start simultaneously.

Many fires began at the exact same moment.

Describing a chain reaction.

6

The translator spoke simultaneously as the president gave his speech.

The translation happened in real-time.

Specific professional context.

7

The system backs up your data simultaneously to the cloud and a local drive.

It saves in two places at once.

Technical reliability context.

8

The two musicians played their solos simultaneously, creating a complex sound.

They both played at the same time.

Artistic context.

1

The government is trying to curb inflation while simultaneously promoting growth.

They are doing two difficult things at once.

Discussing policy and trade-offs.

2

The new processor can execute billions of operations simultaneously.

The chip is very fast and does many things at once.

High-level technical description.

3

The film uses a split-screen to show two related scenes simultaneously.

The screen is divided to show two things at once.

Media and film analysis.

4

The researchers monitored brain activity and heart rate simultaneously during the experiment.

They tracked two biological signals at once.

Scientific methodology.

5

The book is simultaneously a gripping thriller and a profound social commentary.

The book has two different identities at once.

Literary criticism.

6

The company faced simultaneous lawsuits in several different jurisdictions.

Many legal cases happened at the same time.

Legal and corporate context.

7

The two planets will be visible simultaneously in the night sky this evening.

You can see both planets at the same time.

Astronomy context.

8

The protest was organized to take place simultaneously in major cities worldwide.

It was a coordinated global event.

Social and political coordination.

1

The architecture of the building is simultaneously modern and deeply rooted in tradition.

It blends two opposite styles perfectly at once.

Describing aesthetic complexity.

2

The neural network processes vast amounts of data simultaneously to identify patterns.

The AI works like a brain, doing many things at once.

Advanced AI and computing.

3

He was simultaneously hailed as a visionary and dismissed as a crank by his peers.

People had two very different opinions of him at once.

Describing conflicting public perceptions.

4

The treaty aims to ensure security while simultaneously fostering economic cooperation.

It has two major, parallel goals.

Diplomatic and legal precision.

5

The artist's work explores the simultaneous presence of beauty and decay in nature.

The art shows two opposite things in one image.

Philosophical and artistic analysis.

6

The system is designed for high availability, with data being written to multiple sites simultaneously.

Data is saved in many places at once for safety.

Enterprise-level technical writing.

7

The simultaneous collapse of several major banks led to a global financial crisis.

Many banks failed at the exact same time.

Economic history and analysis.

8

The poem captures the simultaneous feeling of longing and belonging.

It describes two complex, overlapping emotions.

Nuanced literary description.

1

In Einstein's theory, the simultaneity of events is relative to the observer's motion.

Whether things happen at once depends on how you move.

Theoretical physics context.

2

The digital age has simultaneously expanded our horizons and narrowed our focus.

Technology has two opposite effects on us at once.

Socio-philosophical commentary.

3

The composer utilized simultaneous polyrhythms to create a sense of controlled chaos.

Many different beats happen at once in the music.

Advanced musicology.

4

The legal framework must address simultaneous developments in biotechnology and ethics.

Law must keep up with two fast-moving fields at once.

Complex policy and ethics.

5

The protagonist experiences a simultaneous sense of multiple timelines unfolding.

The character feels many versions of time at once.

High-concept narrative analysis.

6

The market's reaction was a simultaneous expression of fear and opportunistic greed.

The stock market showed two strong, opposite traits at once.

Nuanced economic psychology.

7

The simultaneous occurrence of these rare phenomena baffled the scientific community.

Two very rare things happened at once, which was confusing.

Describing extreme coincidences.

8

The project requires the simultaneous management of disparate stakeholders with conflicting interests.

You have to handle many different, difficult people at once.

High-level management and strategy.

Common Collocations

occur simultaneously
broadcast simultaneously
happen simultaneously
run simultaneously
exist simultaneously
work simultaneously
speak simultaneously
process simultaneously
launch simultaneously
published simultaneously

Common Phrases

while simultaneously

— Used to link two actions, emphasizing that the second is happening at the same time as the first.

He was trying to cook dinner while simultaneously helping his kids with homework.

almost simultaneously

— Used when two things happen so close together that they seem to be at the same time.

The two phones rang almost simultaneously.

simultaneously with

— Used to connect an event to another specific point in time or another event.

The new law was introduced simultaneously with the tax cuts.

not simultaneously

— Used to clarify that events must happen at different times.

The two medications should be taken separately, not simultaneously.

simultaneously occurring

— A formal way to describe events that are happening at the same time.

The study looked at simultaneously occurring symptoms in patients.

acting simultaneously

— Describes multiple people or things taking action at the same moment.

The three departments are acting simultaneously to solve the problem.

simultaneously and independently

— Often used in science or logic to show things happen at once but don't affect each other.

The two researchers reached the same conclusion simultaneously and independently.

processed simultaneously

— Common in computing to describe parallel data handling.

All requests are processed simultaneously by the server cluster.

simultaneously present

— Describes multiple qualities or objects that are in the same place at the same time.

Both joy and fear were simultaneously present in the room.

developed simultaneously

— Used to describe things that were created or grew during the same period.

The two technologies were developed simultaneously in different parts of the world.

Often Confused With

simultaneously vs spontaneously

Spontaneously means 'without planning,' while simultaneously means 'at the same time.'

simultaneously vs concurrently

Concurrently often refers to the same time period, while simultaneously refers to the exact same moment.

simultaneously vs instantaneously

Instantaneously means 'immediately,' while simultaneously means 'at the same time as something else.'

Idioms & Expressions

"to have a foot in both camps"

— To be involved with or support two opposing groups simultaneously.

The politician tried to have a foot in both camps by supporting both the workers and the owners.

informal
"to burn the candle at both ends"

— To work very hard without enough rest, often by doing many things simultaneously.

She's been burning the candle at both ends, working a job and studying simultaneously.

informal
"to keep several balls in the air"

— To handle several different tasks or responsibilities simultaneously.

As a manager, he has to keep several balls in the air simultaneously every day.

informal
"to walk and chew gum"

— To be able to do two simple things simultaneously (often used sarcastically).

He's so disorganized, I'm not sure he can walk and chew gum simultaneously.

informal/sarcastic
"at one fell swoop"

— Doing several things simultaneously or in a single action.

He finished all his chores at one fell swoop by doing them simultaneously.

literary
"in the same breath"

— To say two contradictory things almost simultaneously.

He praised the plan and criticized it in the same breath.

neutral
"to kill two birds with one stone"

— To achieve two goals simultaneously with a single action.

By biking to work, I'm exercising and commuting simultaneously, killing two birds with one stone.

neutral
"to play both sides of the fence"

— To support two opposing sides simultaneously, often for personal gain.

The consultant was caught playing both sides of the fence simultaneously.

informal
"to wear many hats"

— To have many different roles or responsibilities simultaneously.

In a small startup, everyone has to wear many hats simultaneously.

neutral
"to ride two horses at once"

— To try to do two things simultaneously that are very difficult to combine.

You can't ride two horses at once; you need to focus on one project at a time.

informal

Easily Confused

simultaneously vs spontaneously

They sound similar and both end in '-ously'.

Simultaneously is about timing (when). Spontaneously is about the lack of planning (how).

They simultaneously started laughing (at the same time). They spontaneously started laughing (suddenly, for no reason).

simultaneously vs concurrently

They are often used as synonyms in professional contexts.

Simultaneously is more about the exact instant. Concurrently is more about parallel tracks over time.

The two runners finished simultaneously. The two courses are offered concurrently this semester.

simultaneously vs synchronously

Both refer to things happening at the same time.

Synchronously implies coordination or being in sync with a clock. Simultaneously is more general.

The dancers moved synchronously. The two accidents happened simultaneously.

simultaneously vs instantaneously

Both relate to time and speed.

Instantaneously means 'in an instant' or 'without delay.' Simultaneously means 'at the same time as another event.'

The light turned on instantaneously. The two lights turned on simultaneously.

simultaneously vs consecutively

They both describe the timing of multiple events.

Consecutively means one after another. Simultaneously means at the same time.

He won three games consecutively. They played three games simultaneously.

Sentence Patterns

A1

Subject + Verb + simultaneously.

They laughed simultaneously.

A2

Subject + was/were + Verb-ing + simultaneously.

He was singing simultaneously.

B1

Subject + Verb + while simultaneously + Verb-ing.

She worked while simultaneously studying.

B2

Subject + Verb + simultaneously with + Noun.

The launch occurred simultaneously with the announcement.

C1

It was simultaneously + Adjective + and + Adjective.

It was simultaneously beautiful and terrifying.

C2

The simultaneity of + Noun + is + Adjective.

The simultaneity of the events is questionable.

B1

Two things + Verb + simultaneously.

The two bells rang simultaneously.

B2

Subject + were + simultaneously + Past Participle.

The shows were simultaneously broadcast.

Word Family

Nouns

Adjectives

Related

How to Use It

frequency

The word is common in academic and professional writing but less frequent in casual spoken English.

Common Mistakes
  • Confusing it with 'spontaneously'. Use 'simultaneously' for timing and 'spontaneously' for lack of planning.

    Learners often mix these up because they sound similar. Remember: 'simul' = same time.

  • Saying 'simultaneously at the same time'. Use one or the other, not both.

    This is a redundant phrase. 'Simultaneously' already means 'at the same time.'

  • Using it when events are only 'on the same day'. Use 'on the same day' or 'concurrently'.

    'Simultaneously' implies a much tighter, almost exact timing.

  • Misspelling as 'simultainously'. Simultaneously (with an 'e').

    The 'e' before the 'ous' is often forgotten. Think of 'simultaneous' + 'ly'.

  • Using 'simultaneously to' instead of 'simultaneously with'. Simultaneously with.

    The correct preposition to connect two simultaneous events is 'with.'

Tips

Avoid Redundancy

Never write 'simultaneously at the same time.' It's like saying 'the round circle.' Choose one or the other to keep your writing professional and concise.

Master the Syllables

The word has five syllables: sim-ul-ta-ne-ous-ly. Practice saying it slowly and then speed up. The stress is on the third syllable: TANE.

Formal vs. Casual

Use 'simultaneously' in essays, reports, and business emails. Use 'at the same time' when chatting with friends or family to avoid sounding too stiff.

Placement Matters

For the best flow, place 'simultaneously' after the verb or at the end of the sentence. 'They arrived simultaneously' sounds better than 'They simultaneously arrived' in most cases.

Listen for the 'Sync'

When you hear 'simultaneously' in a news report, it often means the events were planned to happen together. This can give you a clue about the story's meaning.

The 'U' is Key

Don't forget the 'u' after 'simul.' Many people accidentally write 'simoltaneously' or 'simultaneously' without the 'u'. Remember: SIM-UL.

Use with 'While'

The phrase 'while simultaneously' is a powerful way to describe multitasking. 'He was reading while simultaneously listening to music.'

Technical Precision

In science, use 'simultaneously' to describe events that occur in the same experimental window. It shows you are paying attention to the details of timing.

Describe Emotions

Use 'simultaneously' to describe complex characters who feel two things at once, like 'simultaneously brave and terrified.' It adds depth to your descriptions.

Business Efficiency

In a job interview, use 'simultaneously' to describe how you manage multiple projects. It makes you sound organized and capable of high-level work.

Memorize It

Mnemonic

Think of 'SIM' like a 'SIM card' in your phone. A phone can do many things SIM-ultaneously: call, text, and browse the web all at once.

Visual Association

Imagine a person juggling three balls. The balls are all in the air simultaneously. Or imagine a split-screen TV showing two different games at once.

Word Web

Time Parallel Sync Together Moment Overlap Coincide Double

Challenge

Try to write three sentences about your morning routine using the word 'simultaneously.' For example: 'I brush my teeth while simultaneously thinking about my breakfast.'

Word Origin

The word 'simultaneously' comes from the Latin word 'simultaneus,' which is derived from 'simul,' meaning 'at the same time' or 'together.' It entered the English language in the mid-17th century.

Original meaning: The original meaning in Latin was 'happening at the same time,' which has remained consistent throughout its history in English.

It belongs to the Indo-European language family, specifically the Italic branch through Latin.

Cultural Context

There are no major sensitivities associated with this word, but be careful not to use it to describe people's actions in a way that sounds robotic or overly technical unless that is your intention.

In English-speaking business culture, 'simultaneous' is a high-frequency word used to project efficiency and technical competence.

The 'Relativity of Simultaneity' in Albert Einstein's Special Theory of Relativity. Simultaneous exhibitions in chess, where one grandmaster plays many opponents at once. The concept of 'Simultaneous Contrast' in color theory by Michel Eugène Chevreul.

Practice in Real Life

Real-World Contexts

Computing

  • simultaneous users
  • process simultaneously
  • simultaneous access
  • run simultaneously

Sports

  • finish simultaneously
  • simultaneous hit
  • touch simultaneously
  • start simultaneously

News/Media

  • broadcast simultaneously
  • protests erupted simultaneously
  • launched simultaneously
  • published simultaneously

Daily Life

  • talking simultaneously
  • happening simultaneously
  • doing things simultaneously
  • arriving simultaneously

Science

  • occur simultaneously
  • monitored simultaneously
  • react simultaneously
  • measured simultaneously

Conversation Starters

"Do you think it's actually possible for humans to do two things simultaneously, or do we just switch fast?"

"Have you ever had two things go wrong in your life simultaneously? How did you handle it?"

"If you could learn two languages simultaneously, which ones would you choose and why?"

"What are some activities that you enjoy doing simultaneously, like listening to music while working?"

"In your opinion, is it better for a movie to have one main story or several stories happening simultaneously?"

Journal Prompts

Describe a time when you felt two very different emotions simultaneously. What caused them, and how did it feel?

Write about a busy day where you had to manage several tasks simultaneously. What was your strategy for staying organized?

Imagine a world where everyone could hear everyone else's thoughts simultaneously. How would society change?

Reflect on a historical event where multiple things happened simultaneously to change the course of history.

Do you believe that technology helps us do things simultaneously, or does it just make us more distracted?

Frequently Asked Questions

10 questions

The main difference is formality. 'Simultaneously' is more formal and precise, making it ideal for academic or professional writing. 'At the same time' is more common in everyday conversation. For example, you might say 'We arrived at the same time' to a friend, but write 'The data was processed simultaneously' in a report.

Yes, but it usually implies a very close timing. If things happen on the same day but hours apart, 'simultaneously' is usually not the right word. In that case, you might use 'on the same day' or 'concurrently' if they are ongoing processes.

'Simultaneously' is an adverb. The adjective form is 'simultaneous.' You use the adverb to describe *how* an action happens (They spoke simultaneously) and the adjective to describe a noun (It was a simultaneous broadcast).

A good way to remember is to break it down: SIM-UL-TANE-OUS-LY. Make sure to include the 'u' after the 'l' and the 'e' before the 'ous.' It is a long word, so practicing it in parts helps.

Yes, you can. When you do, it is usually followed by a comma. For example: 'Simultaneously, the two companies announced their merger.' This is a good way to vary your sentence structure in formal writing.

No, they are very different. 'Simultaneously' means at the same time. 'Spontaneously' means something happened suddenly or without being planned. For example, if two people shout 'Surprise!' at once, they did it simultaneously. If one person suddenly decides to jump into a lake, they did it spontaneously.

Common synonyms include 'concurrently,' 'synchronously,' 'at the same time,' 'all at once,' and 'in unison.' The best one to use depends on whether you are in a technical, formal, or casual setting.

It implies *at least* two things, but it can be many more. For example, 'Hundreds of fireworks exploded simultaneously.' The word always describes a relationship between multiple events or actions in time.

The most common and correct preposition to use is 'with.' For example, 'The new software was released simultaneously with the hardware.' Using 'to' is generally considered incorrect in this context.

Yes, it is very common to use it to describe having two different emotions at once. For example, 'I felt simultaneously excited and nervous about the big move.' This helps to show the complexity of human feelings.

Test Yourself 200 questions

writing

Write a sentence about two things you do at the same time in the morning using 'simultaneously'.

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writing

Describe a scene in a movie where two things happen at once using 'simultaneously'.

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writing

Explain why a computer needs to perform tasks simultaneously.

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writing

Write a formal sentence about a company's international product launch.

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writing

Use 'simultaneously' to describe a complex emotion you have felt.

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writing

Create a sentence using 'while simultaneously' and two continuous verbs.

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writing

Write a sentence about a scientific experiment using 'occur simultaneously'.

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writing

Describe a coordinated protest using 'simultaneously'.

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writing

Write a sentence about a sports finish using 'simultaneously'.

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writing

Use 'simultaneously' to describe a book or a movie that has two different themes.

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writing

Write a sentence about a computer's ability to handle many users.

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writing

Describe a musical performance using 'simultaneously'.

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writing

Write a sentence about two people talking at once.

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writing

Use 'simultaneously' to describe a government's difficult task.

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writing

Write a sentence about a historical event with two parts.

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writing

Describe a technical process using 'simultaneously'.

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writing

Write a sentence about a close finish in a car race.

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writing

Use 'simultaneously' to describe an artist's style.

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writing

Write a sentence about a multi-tasking office worker.

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writing

Describe a weather event using 'simultaneously'.

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speaking

Pronounce the word 'simultaneously' slowly, syllable by syllable.

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speaking

Use 'simultaneously' in a sentence about your favorite hobbies.

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speaking

Explain the meaning of 'simultaneously' to a friend who doesn't know the word.

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speaking

Describe a time you had to multitask at work using 'simultaneously'.

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speaking

What are the benefits of a computer doing things simultaneously?

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speaking

How do you feel about simultaneous translation at conferences?

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speaking

Give an example of two things that cannot happen simultaneously.

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speaking

Use 'simultaneously' to describe a complex movie plot.

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speaking

What is the difference between 'simultaneously' and 'sequentially'?

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speaking

Describe a sports event where two people finished simultaneously.

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speaking

How do you handle having multiple deadlines simultaneously?

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speaking

Can you think of a song where two people sing different lyrics simultaneously?

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speaking

What are some common mistakes people make with this word?

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speaking

Why is 'simultaneously' a good word for formal writing?

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speaking

Use 'simultaneously' to describe a scientific discovery.

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speaking

Is it possible to feel happy and sad simultaneously?

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speaking

What does 'almost simultaneously' mean to you?

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speaking

Describe a busy kitchen using 'simultaneously'.

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speaking

How do you pronounce the US version of the word?

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speaking

What is the stress pattern of the word?

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listening

Listen to the sentence: 'The two shots were fired simultaneously.' How many shots were there?

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listening

In the phrase 'broadcast simultaneously,' what is being described?

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listening

Does the speaker say 'simultaneously' or 'spontaneously'?

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listening

Listen for the stress. Which syllable is the loudest?

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listening

What happened at the same time as the alarm in the sentence?

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listening

Is the speaker using a formal or informal register?

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listening

What is the second action mentioned in the 'while simultaneously' sentence?

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listening

How many syllables did you hear in the word?

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listening

Did the events happen 'sequentially' or 'simultaneously'?

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listening

What was the result of the simultaneous finish in the race?

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listening

Which word did the speaker use for 'at the same time'?

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listening

Was the word used to describe emotions or actions?

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listening

Listen to the UK pronunciation. How does it differ from the US one?

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listening

What was launched simultaneously in the news report?

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listening

What did the two people say simultaneously?

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/ 200 correct

Perfect score!

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