reaction
reaction en 30 secondes
- A reaction is a response to a trigger, which can be emotional, physical, or chemical in nature.
- It is commonly used with the preposition 'to' and verbs like 'trigger', 'cause', or 'have'.
- In science, it specifically refers to the process of substances changing into new forms through chemical bonds.
- The word can describe individual feelings or large-scale public responses to news or events.
The word reaction is a versatile noun that describes what happens after something else occurs. At its most basic level, it is a response. Imagine you touch a hot stove; your hand pulling away instantly is a physical reaction. If someone tells you a funny joke, your laughter is an emotional reaction. In the world of science, particularly chemistry, a reaction is the process where substances change into new ones. For example, mixing vinegar and baking soda causes a bubbly reaction. Understanding 'reaction' involves recognizing the relationship between a 'cause' and an 'effect'. It is the second half of an interaction. In social contexts, we often measure the success of an event by the 'audience reaction'. If the reaction is positive, the event was a success. If the reaction is negative, changes might be needed. This word helps us describe the feedback loop that exists in almost every part of life, from biology to politics to personal relationships.
- Physical Reaction
- An automatic movement of the body, like blinking when something flies toward your eye.
- Chemical Reaction
- A process where molecules rearrange to form different substances, often involving heat or light.
- Social Reaction
- How a group of people feels or acts after hearing news or seeing a performance.
The crowd's reaction to the goal was deafening; everyone stood up and cheered at once.
In a deeper sense, a reaction can be delayed or immediate. A 'gut reaction' is something you feel instantly without thinking, while a 'considered reaction' comes after you have had time to process information. Scientists study reactions to understand how the world works. A chemist might spend years studying the reaction between two rare metals. A psychologist might study the reaction of children to a new type of game. In every case, the focus is on the change or the behavior that follows a specific trigger. The word comes from the Latin 'reactio', which literally means 'acting back'. This 'acting back' is the core of the definition.
Her reaction to the news was a mixture of surprise and pure joy.
The chemical reaction produced a bright blue flame and a lot of smoke.
There was a strong public reaction against the new tax laws proposed by the government.
His quick reaction saved the glass from falling off the table and breaking.
Using the word 'reaction' correctly requires understanding its common pairings with verbs and prepositions. Most commonly, we use the preposition 'to'. You have a reaction to something. You don't have a reaction 'on' or 'at' something. Common verbs that precede 'reaction' include 'get', 'have', 'cause', 'trigger', and 'provoke'. For instance, 'The news triggered a violent reaction in the stock market.' This implies the news was the spark that started the change. If you are describing the quality of the response, you can use adjectives like 'positive', 'negative', 'mixed', 'strong', 'slow', or 'instant'.
- Chain Reaction
- A series of events where each one causes the next, like a row of falling dominoes.
- Allergic Reaction
- When your body reacts badly to something like peanuts or pollen.
- Knee-jerk Reaction
- A quick response made without thinking, often used to describe a predictable or thoughtless action.
In academic writing, 'reaction' is often used to discuss data or results. You might write about the 'reaction rate' in a chemistry paper, which describes how fast a process happens. In literature or film studies, you might analyze the 'audience reaction' to a specific scene. It is a formal enough word for professional settings but simple enough for daily conversation. When you want to sound more precise, you might replace 'answer' or 'reply' with 'reaction' if you are focusing on the feelings or the nature of the response rather than just the words spoken.
You will encounter 'reaction' in many different environments. In a school science lab, the teacher will often say, 'Watch the reaction closely.' They want you to see the change in color or the bubbles forming. In a news broadcast, a reporter might say, 'We are waiting for a reaction from the White House,' meaning they are waiting for an official statement or response to an event. On social media, people talk about 'reaction videos,' where a creator films themselves watching and responding to another video. This has become a massive genre of entertainment.
In a hospital, a doctor might ask, 'Did you have any reaction to the medication?' They are checking for side effects like a rash or dizziness. In sports, commentators often praise a player's 'quick reactions,' referring to their ability to move fast in response to the ball or an opponent. Even in casual conversation, if you tell a friend a secret, you might say, 'I didn't expect that reaction!' if they laugh when you thought they would be angry. It is a word that bridges the gap between technical science and everyday human emotion.
One of the most frequent errors is confusing 'reaction' with 'response'. While they are often synonyms, 'reaction' usually implies something more immediate or physical, whereas 'response' can be more calculated or verbal. Another mistake is using the wrong preposition. Learners often say 'reaction of' when they mean 'reaction to'. For example, 'His reaction of the movie' is incorrect; it should be 'His reaction to the movie'.
In science, students sometimes confuse 'reaction' with 'equation'. The reaction is the physical event; the equation is the written representation of that event on paper. Additionally, avoid using 'reaction' when you simply mean 'action'. An action is the first thing that happens; the reaction is what follows. If you start a fight, that is an action. If the other person hits back, that is their reaction. Mixing these up can confuse the timeline of events in your storytelling or reporting.
There are several words that share a similar meaning with 'reaction', but each has its own nuance. 'Response' is the closest synonym and is often interchangeable, though it sounds slightly more formal. 'Reply' and 'answer' are specifically for verbal or written communication. If someone asks a question, you give an answer; you wouldn't usually call it a 'reaction' unless you are talking about the tone of your voice or your facial expression.
'Feedback' is another related word, often used in business or learning. It refers to a reaction that is meant to improve something. 'Reflex' is a specific type of reaction that is involuntary and very fast, like blinking. 'Backlash' is a strong, negative social or political reaction. 'Consequence' is the result of an action, but it doesn't necessarily involve a 'response' from a person or substance—it's just what happens next. Choosing the right word depends on whether you are talking about chemistry, emotions, or formal communication.
How Formal Is It?
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Niveau de difficulté
Grammaire à connaître
Exemples par niveau
His reaction was a big smile.
Su reacción fue una gran sonrisa.
Simple subject + verb + noun phrase.
What was her reaction?
¿Cuál fue su reacción?
Question form using 'what'.
The baby had a funny reaction.
El bebé tuvo una reacción divertida.
Use of 'had' to describe experiencing a reaction.
I saw your reaction to the gift.
Vi tu reacción al regalo.
Preposition 'to' links the reaction to the cause.
It was a quick reaction.
Fue una reacción rápida.
Adjective 'quick' modifying the noun.
She had no reaction.
Ella no tuvo ninguna reacción.
Negative construction using 'no'.
My reaction was 'Wow!'
Mi reacción fue '¡Guau!'.
Using a quote as the complement.
The dog's reaction was to bark.
La reacción del perro fue ladrar.
Possessive 's' with the subject.
The chemical reaction made bubbles.
La reacción química hizo burbujas.
Scientific context.
He had an allergic reaction to the cat.
Él tuvo una reacción alérgica al gato.
Medical context.
Tell me your reaction to the news.
Dime tu reacción a la noticia.
Imperative 'tell me'.
The crowd's reaction was very loud.
La reacción de la multitud fue muy ruidosa.
Adverb 'very' modifying 'loud'.
Is there a reaction when you mix them?
¿Hay una reacción cuando los mezclas?
Interrogative with 'is there'.
Her reaction changed after a minute.
Su reacción cambió después de un minuto.
Past tense verb 'changed'.
I was surprised by his reaction.
Me sorprendió su reacción.
Passive-like structure 'surprised by'.
Wait for the reaction to happen.
Espera a que ocurra la reacción.
Infinitive 'to happen' following the noun.
The government's reaction was too slow.
La reacción del gobierno fue demasiado lenta.
Abstract subject (government).
It was a chain reaction of mistakes.
Fue una reacción en cadena de errores.
Metaphorical use of 'chain reaction'.
The medication caused a skin reaction.
El medicamento causó una reacción en la piel.
Verb 'caused' showing causality.
What is the typical reaction to this drug?
¿Cuál es la reacción típica a esta droga?
Adjective 'typical' for generalization.
The public reaction was mostly negative.
La reacción del público fue mayormente negativa.
Adverb 'mostly' modifying the adjective.
He acted without thinking, a gut reaction.
Actuó sin pensar, una reacción visceral.
Appositive phrase 'a gut reaction'.
The reaction rate depends on the temperature.
La velocidad de reacción depende de la temperatura.
Compound noun 'reaction rate'.
We need to gauge the reaction of the investors.
Necesitamos medir la reacción de los inversores.
Verb 'gauge' meaning to measure or assess.
The news provoked a strong reaction from the unions.
La noticia provocó una fuerte reacción de los sindicatos.
Strong verb 'provoked'.
It was a knee-jerk reaction to the crisis.
Fue una reacción instintiva a la crisis.
Idiomatic 'knee-jerk'.
The chemical reaction produces heat as a byproduct.
La reacción química produce calor como subproducto.
Technical term 'byproduct'.
Her reaction to the criticism was very professional.
Su reacción a la crítica fue muy profesional.
Abstract noun 'criticism'.
There was a backlash, a negative reaction to the policy.
Hubo una reacción violenta, una reacción negativa a la política.
Synonym 'backlash' used for emphasis.
The pilot's quick reactions saved the plane.
Las rápidas reacciones del piloto salvaron el avión.
Plural 'reactions' referring to skills.
Scientists are studying the reaction of the virus to the heat.
Los científicos están estudiando la reacción del virus al calor.
Present continuous tense.
The play received a mixed reaction from the critics.
La obra recibió una reacción mixta de los críticos.
Collocation 'mixed reaction'.
The policy change elicited a visceral reaction from the public.
El cambio de política provocó una reacción visceral del público.
Sophisticated verb 'elicited'.
The reaction was disproportionate to the actual event.
La reacción fue desproporcionada al evento real.
Adjective 'disproportionate'.
He is known for his reactionary views on education.
Es conocido por sus puntos de vista reaccionarios sobre la educación.
Adjective form 'reactionary'.
The catalytic reaction occurred in a vacuum.
La reacción catalítica ocurrió en el vacío.
Specific scientific adjective 'catalytic'.
The market's reaction was a bellwether for the economy.
La reacción del mercado fue un indicador para la economía.
Metaphorical 'bellwether'.
Her reaction was tempered by years of experience.
Su reacción fue moderada por años de experiencia.
Passive 'tempered by'.
The spontaneous reaction surprised even the researchers.
La reacción espontánea sorprendió incluso a los investigadores.
Adjective 'spontaneous'.
The internal reaction within the party was one of shock.
La reacción interna dentro del partido fue de conmoción.
Prepositional phrase 'within the party'.
The synthesis was the result of a complex organic reaction.
La síntesis fue el resultado de una compleja reacción orgánica.
Highly technical vocabulary.
The diplomat's reaction was carefully calibrated to avoid offense.
La reacción del diplomático fue cuidadosamente calibrada para evitar la ofensa.
Adverb-adjective pairing 'carefully calibrated'.
We must consider the socio-political reaction to such a move.
Debemos considerar la reacción sociopolítica a tal movimiento.
Compound adjective 'socio-political'.
The reaction kinetics were studied using laser spectroscopy.
La cinética de la reacción se estudió mediante espectroscopia láser.
Specialized field 'kinetics'.
His reaction was an instinctive recoil from the grotesque.
Su reacción fue un retroceso instintivo ante lo grotesco.
Literary style.
The nuclear reaction reached criticality within seconds.
La reacción nuclear alcanzó la criticidad en segundos.
Nuclear physics terminology.
The aesthetic reaction to the painting was one of sublime awe.
La reacción estética a la pintura fue de asombro sublime.
Abstract philosophical context.
The reactionary forces sought to dismantle the new reforms.
Las fuerzas reaccionarias buscaron desmantelar las nuevas reformas.
Political science usage of 'reactionary'.
Collocations courantes
Phrases Courantes
in reaction to
set off a reaction
gauge the reaction
wait for a reaction
provoke a reaction
elicit a reaction
immediate reaction
delayed reaction
positive reaction
negative reaction
Souvent confondu avec
Response is more formal and often involves words; reaction is more immediate and can be physical.
Action is the cause; reaction is the effect.
In science, the reaction is the event; the equation is the written description.
Expressions idiomatiques
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Facile à confondre
Structures de phrases
Comment l'utiliser
Often negative, implying a move backward.
Always refers to a change in chemical identity.
Reaction is often more impulsive; response is often more planned.
-
His reaction of the news was bad.
Always use 'to' after reaction.
-
The reaction happened between the two chemicals.
'Occurred' is more formal and common in science.
-
I had a big reaction for the movie.
Preposition error; use 'to'.
-
It was a knee-hit reaction.
The idiom is specifically 'knee-jerk'.
-
The reaction was very fastly.
Use the adjective 'fast' to describe the noun 'reaction'.
Astuces
Use 'to' with reaction
Always remember to use the preposition 'to'. You react to something, so your reaction is to that thing. This is a very common mistake for learners.
Learn collocations
Learn words that go with reaction, like 'strong', 'mixed', or 'allergic'. This will make your English sound more natural and fluent in both speaking and writing.
Chemical vs Physical
In science, distinguish between a chemical reaction (new substances) and a physical reaction (just a change in state). This precision is important for academic success.
Describe the face
When describing a reaction, mention facial expressions. 'His reaction was clear from the look on his face' is a great way to add detail to your stories.
Gut Reaction
Use the phrase 'gut reaction' when you want to talk about your first, most honest feeling. It is a very common and useful idiom in daily English conversation.
Countable Noun
Treat 'reaction' as a countable noun. You can say 'many reactions' or 'a reaction'. Don't forget the article 'a' or 'the' before the singular form.
Vary your words
If you use 'reaction' in one sentence, try using 'response' or 'feedback' in the next. This prevents your writing from becoming repetitive and boring for the reader.
Listen for the trigger
When you hear the word 'reaction', listen for what caused it. The speaker will usually mention the cause immediately after using the preposition 'to'.
Social Media
Understand that 'reaction' is a huge part of internet culture. Knowing what a 'reaction video' is will help you understand many modern online conversations and trends.
Reaction Time
Use the term 'reaction time' to talk about how fast someone responds. It is useful in sports, driving, and gaming contexts to describe skill and speed.
Mémorise-le
Moyen mnémotechnique
RE-ACTION: You ACT AGAIN after someone else acts first.
Origine du mot
Latin
Contexte culturel
Chemical reactions are the basis of all life and technology.
Reactionary describes a desire to return to a previous political state.
Reaction videos are a popular genre where creators react to music or news.
Pratique dans la vie réelle
Contextes réels
Amorces de conversation
"What was your reaction to the latest movie?"
"How do you usually react to stressful news?"
"Have you ever seen a cool chemical reaction?"
"What is the funniest reaction you've ever seen from a pet?"
"Do you trust your gut reaction when meeting new people?"
Sujets d'écriture
Describe a time you had a strong reaction to a piece of art.
Write about a 'chain reaction' of events that happened in your life.
How do you control your reaction when you are angry?
Reflect on a public reaction to a recent world event.
Think about an allergic reaction you or someone you know has had.
Questions fréquentes
10 questionsYes, 'reaction' is a countable noun. You can have one reaction or many reactions. For example, 'He had several different reactions to the news.' It follows standard pluralization rules in English.
A knee-jerk reaction is an automatic response. It happens without thinking, like your leg kicking when a doctor hits your knee. It is often used to describe a predictable or thoughtless action.
Absolutely, 'reaction' can be positive. You can have a 'positive reaction' to a gift or a 'wonderful reaction' to a performance. It simply describes the nature of the response, whether good or bad.
Feedback is a specific type of reaction. It is usually given to help someone improve or to provide information. A reaction is more general and can just be an emotion or a physical change.
In science, use 'reaction' to describe the process of change. For example, 'The reaction between the acid and the base produced salt.' Focus on the substances involved and the resulting change.
No, 'reactionary' is usually an adjective. In politics, it describes someone who wants to go back to old ways. While it comes from the same root, it has a very specific and often negative meaning.
A gut reaction is an immediate, instinctive feeling. It is a response that comes from your intuition rather than logical thinking. People often say 'My gut reaction was to say no' to describe an instant feeling.
It is much more common and correct to say 'reaction to'. While you might hear 'reaction for' in very specific contexts, 'to' is the standard preposition used by native speakers.
A chain reaction is a series of events. One event causes the next, which causes the next, and so on. It is like a row of falling dominoes or a nuclear process in a reactor.
It is pronounced re-AC-tion. The stress is on the second syllable. The 'tion' at the end sounds like 'shun'. It rhymes with words like 'action' and 'fraction'.
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Summary
The word 'reaction' is essential for describing the 'effect' in a cause-and-effect relationship, whether you are talking about human emotions, physical movements, or scientific processes in a laboratory.
- A reaction is a response to a trigger, which can be emotional, physical, or chemical in nature.
- It is commonly used with the preposition 'to' and verbs like 'trigger', 'cause', or 'have'.
- In science, it specifically refers to the process of substances changing into new forms through chemical bonds.
- The word can describe individual feelings or large-scale public responses to news or events.
Use 'to' with reaction
Always remember to use the preposition 'to'. You react to something, so your reaction is to that thing. This is a very common mistake for learners.
Learn collocations
Learn words that go with reaction, like 'strong', 'mixed', or 'allergic'. This will make your English sound more natural and fluent in both speaking and writing.
Chemical vs Physical
In science, distinguish between a chemical reaction (new substances) and a physical reaction (just a change in state). This precision is important for academic success.
Describe the face
When describing a reaction, mention facial expressions. 'His reaction was clear from the look on his face' is a great way to add detail to your stories.
Exemple
The children had a happy reaction to the surprise party.
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