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B1 noun #22 よく出る 14分で読める

billion

上位22

練習する例文メモとヒント billion 30秒で

解説 billion in your Level:

The word 'billion' is a very big number. It is much bigger than a hundred or a thousand. Think of a million. Now, think of a thousand millions. That is one billion! We write it like this: 1,000,000,000. It has nine zeros. You might hear this word when people talk about all the people in the world. There are about 8 billion people on Earth. You might also hear it when people talk about very rich people, like billionaires. It is a hard number to imagine because it is so large. If you counted to a billion, one number every second, it would take you more than 31 years! So, when you see 'billion,' just remember it means 'a very, very large amount.' You don't need to use it every day, but it is good to know when you read the news or talk about the world.

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At the A2 level, you should know that 'billion' is a cardinal number used for very large quantities. It is the next major step after 'million.' In English, one billion is 1,000,000,000 (a thousand million). We use it to talk about global populations, big companies, and large amounts of money. For example, 'The world has 8 billion people.' Notice that we say 'billion,' not 'billions,' when there is a number before it. But we say 'billions of' when we don't have a specific number, like 'There are billions of stars.' It is important to pronounce the 'B' clearly so people don't think you are saying 'million.' A billion is 1,000 times bigger than a million, which is a huge difference! You will see this word in news headlines about the economy or science.

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As a B1 learner, you should be comfortable using 'billion' in various contexts, especially in financial and social discussions. A billion is 10 to the power of 9 (1,000,000,000). It is the standard unit for measuring national budgets, the wealth of the world's richest individuals, and astronomical distances. You should be aware of the grammatical rule: use 'billion' (singular) after a number (e.g., 'five billion') and 'billions' (plural) when followed by 'of' (e.g., 'billions of dollars'). In business, you might see the abbreviation 'B' or 'bn.' For example, '$3B' means three billion dollars. It is also used figuratively to mean 'a lot,' though this is informal. Understanding 'billion' helps you follow international news and understand the scale of global issues like climate change or the digital economy.

At the B2 level, you should understand the nuances of 'billion,' including its historical context and its role in different scales. While 'billion' almost always means 1,000,000,000 (the short scale) in modern English, you should be aware that a 'long scale' exists where a billion is a million million. This is rare in modern English but common in other languages. You should be able to use 'billion' accurately in complex sentences, such as 'The government's multi-billion-dollar stimulus package aimed to revitalize the struggling manufacturing sector.' You should also recognize collocations like 'billion-dollar industry' or 'billion-to-one odds.' In academic or professional settings, you might use 'billion' to describe data sets or demographic trends. Being able to distinguish between million, billion, and trillion is crucial for accurate communication in professional environments.

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For C1 learners, 'billion' is a tool for precise and sophisticated communication. You should be adept at using it in formal reports, academic papers, and high-level business discussions. You understand that 'billion' provides a sense of macro-scale that is essential for discussing systemic issues. You should also be familiar with the financial slang 'yard' and the metric prefix 'giga-,' which are often used as synonyms or related terms in specific fields. Your usage should be flawless, including the correct use of hyphens in compound adjectives like 'a twenty-billion-euro deficit.' Furthermore, you should be able to critically analyze how the word 'billion' is used rhetorically in political or corporate discourse to emphasize or obscure the true scale of figures. You are also aware of the cultural implications of the word, such as the 'billionaire' status as a symbol of extreme wealth and influence.

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At the C2 level, you have a masterly command of 'billion' and its place within the broader system of large numbers and scientific notation. You are aware of the etymological roots (from 'bi-' and 'million') and how the definition shifted over time and across geographies. You can navigate the potential pitfalls of international communication where 'billion' might be misinterpreted due to the long/short scale discrepancy. You use the word with stylistic flair, perhaps employing it in metaphors or to create a specific rhetorical effect. You are also comfortable with related concepts like 'orders of magnitude' and can explain the logarithmic difference between a million, a billion, and a trillion to others. In your professional life, you handle billion-scale data or finances with ease, ensuring that your written and spoken English reflects the precision and authority expected at this level.

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練習する例文メモとヒント

billion 30秒で

A billion is a cardinal number equal to one thousand million (1,000,000,000), characterized by nine zeros in the standard short scale used in English.
It is a crucial unit for measuring global populations, national economies, and astronomical distances, providing a sense of immense scale beyond everyday experience.
Grammatically, it remains singular after a specific number (e.g., 'five billion') but becomes plural in the phrase 'billions of' to indicate an unspecified large amount.
While modern English uses the short scale, learners should be aware of the historical long scale (a million million) still present in some other languages.

The word 'billion' is a numerical powerhouse, representing a scale that often escapes human intuition. In the standard short scale used in the United States, the United Kingdom, and most international financial contexts, a billion is defined as 1,000,000,000—that is, one followed by nine zeros. This is equivalent to a thousand millions. Understanding this word is crucial because it serves as the primary unit for discussing global phenomena, from the human population to the valuation of the world's largest technology companies. When we speak of a billion, we are moving beyond the realm of personal experience and into the realm of macroeconomics, astronomy, and big data. For instance, the human brain contains approximately 86 billion neurons, a figure that illustrates the staggering complexity of biological systems. In common usage, 'billion' is often paired with currency to describe the wealth of individuals or the budgets of entire nations. It is a word that conveys immense magnitude, often used to emphasize the sheer scale of a project or a problem.

Mathematical Scale: In scientific notation, a billion is expressed as 10 to the power of 9. It represents a thousand-fold increase over a million.

The global population reached eight billion people in late 2022, marking a significant milestone in human history.

Historically, the word 'billion' has been a source of linguistic confusion. In the 'long scale' system, which was formerly common in the UK and remains standard in many European and Spanish-speaking countries, a billion refers to a million millions (1,000,000,000,000 or 10 to the power of 12). However, in modern English-speaking media and business, the short scale (10 to the power of 9) is the universal standard. This transition occurred in the UK during the 1970s to align with American financial reporting. When using the word today, one can almost always assume it refers to a thousand million, but in historical texts or specific European contexts, it is wise to verify the intended scale. The word is also frequently used hyperbolically in informal speech to mean 'a very large number,' as in 'I have a billion things to do today,' though this is technically an exaggeration.

Financial Context: A billion-dollar valuation is often the threshold for a startup to be classified as a 'unicorn' in the venture capital world.

The government announced a three billion dollar investment into renewable energy infrastructure.

In terms of grammar, 'billion' functions similarly to 'hundred' or 'thousand.' When used with a specific number, it remains singular: 'five billion people.' However, when used as an indefinite plural to suggest a vast quantity, it takes the 's': 'billions of stars.' This distinction is vital for learners to master. Furthermore, the word is often abbreviated as 'B' or 'bn' in financial news, such as '$5B' or '£10bn.' In the world of technology, the prefix 'giga-' is the metric equivalent, as seen in 'gigabytes' (a billion bytes). Whether discussing the distance to the stars or the national debt, 'billion' is the essential unit for measuring the massive scales of the modern world.

Scientific Usage: Astronomers use billions to describe the number of galaxies in the observable universe, currently estimated at two trillion.

There are over a billion active users on the social media platform every single day.

The tech giant's quarterly profit exceeded ten billion dollars for the first time.

Scientists estimate that the Earth is approximately four and a half billion years old.

Using 'billion' correctly requires an understanding of its grammatical behavior as both a quantifier and a noun. When 'billion' follows a specific number or a determiner like 'a' or 'several,' it does not take a plural 's.' For example, we say 'two billion dollars,' not 'two billions dollars.' This is a common point of confusion for learners who are used to pluralizing nouns after numbers. However, when 'billion' is used to describe an unspecified, very large quantity, it acts as a plural noun followed by 'of.' In this case, you would say 'billions of people' or 'billions of stars.' This structure emphasizes the vastness and lack of a precise count. It is also important to note that 'billion' can be used as an adjective in compound forms, such as 'a billion-dollar project,' where the hyphen links the number and the unit to describe a noun.

Precise Count: The merger is expected to create a company worth forty billion dollars.

The project requires a ten billion euro investment over the next decade.

In financial and news reporting, 'billion' is often used to provide context for large-scale economic data. You will frequently see it in phrases like 'billion-dollar deficit' or 'billion-dollar surplus.' When discussing populations or demographics, 'billion' is the standard unit for global or continental scales. For example, 'Asia is home to more than four billion people.' In these contexts, the word provides a sense of gravity and scale that 'million' simply cannot achieve. It is also worth noting the placement of currency symbols. In written English, the symbol usually comes before the number, but the word 'billion' follows it: '$1 billion' is read as 'one billion dollars.' If you are writing out the full phrase, it is 'one billion dollars,' not 'one dollars billion.'

Indefinite Plural: There are billions of galaxies in the universe, each containing billions of stars.

He has billions of ideas, but he rarely puts any of them into practice.

In more technical or academic writing, 'billion' might be replaced by scientific notation (10^9) or metric prefixes (giga-) to ensure precision and avoid the short/long scale ambiguity. However, in general journalism and literature, 'billion' remains the preferred term. It carries a certain rhetorical weight; saying a company is worth 'a billion dollars' sounds more impressive than saying it is worth 'a thousand million dollars.' When speaking, the word is usually stressed on the first syllable: BIL-lion. It is important to pronounce the 'b' clearly to distinguish it from 'million,' as the two words sound very similar in noisy environments or fast speech. This phonetic similarity often leads to the use of 'm' and 'b' as shorthand in verbal communication among finance professionals.

Compound Adjective: The billionaire philanthropist funded a multi-billion-dollar initiative to eradicate malaria.

The software update was downloaded by over a billion devices worldwide.

The light from that star took three billion years to reach our telescopes.

The city spent two billion dollars on the new subway line.

You will encounter the word 'billion' most frequently in news broadcasts, financial reports, and scientific documentaries. In the realm of business news, it is the standard unit for discussing the market capitalization of major corporations like Apple, Microsoft, or Amazon, which are often valued in the hundreds or thousands of billions (trillions). When a news anchor says, 'The company reported a five-billion-dollar loss,' they are signaling a massive economic event. Similarly, in political discourse, 'billion' is used to describe government spending, national debts, and tax revenues. For many citizens, these numbers are so large they become abstract, leading to the phrase 'a billion here, a billion there, and pretty soon you're talking real money,' often attributed to Senator Everett Dirksen to highlight the casual nature of large-scale government spending.

News Media: Journalists use 'billion' to make large data points digestible for the general public.

The central bank injected fifty billion into the economy to prevent a recession.

In the world of science and technology, 'billion' is used to describe the microscopic and the cosmic. You might hear a biologist explain that there are billions of bacteria in a single teaspoon of soil, or an astrophysicist describe a galaxy located ten billion light-years away. In tech, we talk about 'billions of transistors' on a single silicon chip or 'billions of searches' performed on Google every day. These contexts help us appreciate the word's versatility—it is just as useful for describing the very small as it is for the very large. Furthermore, in the entertainment industry, 'billion' is a benchmark for success. A movie that earns 'a billion dollars at the box office' is considered a global blockbuster, a feat achieved by only a small number of films in history.

Social Media: Platforms track 'billions of likes' and 'billions of views' to measure engagement and reach.

The viral video reached one billion views in record time.

Socially, 'billion' has entered the vernacular as a synonym for 'an immense amount.' You might hear someone say, 'I've told you a billion times to clean your room!' While clearly an exaggeration, it shows how the word has become a linguistic tool for emphasis. In the age of social media, 'billion' is also a metric of influence. A YouTuber reaching a billion total views or an Instagram post getting billions of impressions are common topics of conversation in digital marketing. Even in environmental discussions, the word is prominent—scientists warn about the billions of tons of plastic in the oceans or the billions of metric tons of carbon dioxide emitted annually. In every case, 'billion' serves as a wake-up call to the scale of the subject being discussed.

Environmental Science: Global initiatives aim to plant a billion trees to combat climate change.

The charity raised over a billion dollars for disaster relief efforts.

The human heart will beat about two and a half billion times in an average lifetime.

The telescope captured an image of a galaxy ten billion light-years away.

One of the most frequent mistakes learners make with 'billion' is pluralizing it when it follows a specific number. In English, we say 'three billion,' not 'three billions.' The word 'billion' acts as a unit of measurement in this context, much like 'dozen' or 'hundred.' The only time you should use 'billions' is when you are speaking generally and using the 'billions of' construction, such as 'billions of stars.' Another common error is confusing 'billion' with 'million' or 'trillion.' Because these words sound similar and all represent large numbers, it is easy to misspeak. In financial contexts, this mistake can be incredibly costly, so many professionals use the shorthand 'B' or 'yards' to ensure clarity. Always double-check the number of zeros; a billion has nine, while a million has six and a trillion has twelve.

Pluralization Error: Incorrect: 'The company earned five billions dollars.' Correct: 'The company earned five billion dollars.'

It is a common mistake to say billions when a specific number like 'seven' precedes it.

Another significant pitfall is the historical difference between the 'short scale' and the 'long scale.' While the short scale (1,000,000,000) is now standard in English, some older British texts or speakers from countries that use the long scale might still use 'billion' to mean a million million (1,000,000,000,000). If you are translating from French (milliard), German (Milliarde), or Spanish (mil millones), be careful not to use the English 'billion' if you mean 10 to the power of 12. In those languages, their word for 'billion' actually means what English speakers call a 'trillion.' This 'false friend' across languages can lead to massive misunderstandings in international business or scientific collaboration. Always clarify which scale is being used if there is any doubt.

Scale Confusion: In some European languages, 'billion' refers to 1,000,000,000,000, which is a trillion in English.

Avoid using the word billion in international contracts without defining it as 10^9.

Pronunciation is also a key area where mistakes occur. The 'b' at the beginning of 'billion' must be explosive and clear. In fast-paced environments like a stock exchange or a busy office, 'billion' can easily be mistaken for 'million.' To avoid this, some people emphasize the 'B' or use the phrase 'a thousand million' for absolute certainty. Additionally, when writing, ensure you place the commas correctly: 1,000,000,000. Forgetting a set of zeros or misplacing a comma can change the value by a factor of ten or a hundred, which is a catastrophic error in accounting or engineering. Finally, remember that 'billion' is a noun, but it often functions as a determiner. Using it without an article ('He has billion dollars') is incorrect; it should be 'He has a billion dollars' or 'He has one billion dollars.'

Article Usage: Always use 'a' or 'one' before 'billion' when it is the first word of the number phrase.

She spent a billion hours on that project—well, at least it felt like it!

The difference between a million and a billion is much larger than most people realize.

Don't forget the 's' in 'billions of,' but leave it off for 'six billion'.

When discussing large numbers, 'billion' is part of a hierarchy that includes 'million' and 'trillion.' A million is 10 to the power of 6, while a trillion is 10 to the power of 12. Understanding the relationship between these terms is essential for grasping scale. For example, it takes a thousand millions to make one billion, and a thousand billions to make one trillion. If 'billion' feels too precise or you want to use more varied language, you might use 'a thousand million,' which is the literal definition and is still used in some formal or international contexts to avoid confusion with the long scale. In informal settings, people often use 'zillions,' 'gazillions,' or 'bazillions' to mean an indefinitely large number, though these are not real mathematical terms and should never be used in professional writing.

Million vs. Billion: A million is 1,000,000; a billion is 1,000,000,000. The latter is 1,000 times larger.

The jump from a million-dollar budget to a billion-dollar budget is massive.

In the world of finance, you might hear the term 'yard.' This comes from the French word 'milliard,' which means a billion (10^9). Traders use it to distinguish 'billion' from 'million' during loud or fast-paced transactions. Another alternative is the metric prefix 'giga-.' While 'billion' is used for counting discrete items like people or dollars, 'giga-' is used for measurements in the International System of Units (SI). For instance, a 'gigawatt' is a billion watts of power, and a 'gigabyte' is approximately a billion bytes of data. In scientific contexts, using '10 to the ninth' or '10^9' is the most precise way to express a billion, as it removes all linguistic ambiguity. This is particularly important in physics and astronomy where scales can vary by many orders of magnitude.

Billion vs. Trillion: A trillion is 1,000 times larger than a billion. It is 1,000,000,000,000.

While a billion is a huge number, national debts are often measured in trillions.

For creative writing or rhetoric, you might use 'countless,' 'innumerable,' or 'myriad' instead of 'billions of.' These words convey the same sense of a vast, unquantifiable amount without using a specific number. For example, 'myriad stars' sounds more poetic than 'billions of stars.' However, if you are reporting facts, 'billion' is irreplaceable. It provides a concrete anchor for the reader's imagination. In some contexts, 'vast' or 'immense' can serve as adjectives to describe a billion-scale quantity, as in 'a vast sum of money.' Ultimately, the choice between 'billion' and its alternatives depends on the level of precision required and the tone of the communication. In business and science, precision is king; in literature, the feeling of the number often matters more than its exact value.

Informal Alternatives: Words like 'gazillion' are used for humorous exaggeration but have no mathematical value.

The CEO's net worth is estimated at several billion dollars.

The internet is composed of billions of interconnected web pages.

A billion is a one followed by nine zeros in the short scale.

How Formal Is It?

フォーマル

ニュートラル

カジュアル

Child friendly

スラング

豆知識

The United Kingdom officially switched from the long scale (10^12) to the short scale (10^9) for 'billion' only in 1974 to match American usage.

発音ガイド

UK /ˈbɪljən/

US /ˈbɪljən/

The stress is on the first syllable: BIL-lion.

韻が合う語

trillion million zillion gazillion pavilion vermilion postilion cotillion

よくある間違い

Pronouncing it too much like 'million'.
Dropping the 'y' sound in the second syllable.
Mumbling the 'B' so it sounds like an 'M'.
Adding an extra syllable like 'bil-lee-on'.
Confusing it with the pronunciation of 'billionaire'.

難易度

読解 2/5

Easy to recognize in text, though the scale is hard to visualize.

ライティング 3/5

Requires care with pluralization rules (no 's' after numbers).

スピーキング 4/5

Must be pronounced clearly to avoid confusion with 'million'.

リスニング 4/5

Very easy to mishear as 'million' in fast speech.

次に学ぶべきこと

前提知識

number thousand million zero count

次に学ぶ

trillion percentage decimal fraction economy

上級

quadrillion scientific notation logarithmic macroeconomics astrophysics

知っておくべき文法

Collective numbers as adjectives

We say 'five billion people' because billion acts as an adjective here.

Plural nouns with 'of'

We say 'billions of stars' when billion is the head of the noun phrase.

Hyphenation in compound modifiers

A 'billion-dollar deal' requires a hyphen between the number and the unit.

Currency placement

Write '$1 billion' but say 'one billion dollars'.

Subject-verb agreement with large numbers

Ten billion dollars *is* a lot of money (money is uncountable).

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レベル別の例文

There are 8 billion people in the world.

Il y a 8 milliards de personnes dans le monde.

Use 'billion' after a number.

He is a billionaire.

Il est milliardaire.

A billionaire has more than one billion dollars.

A billion is a very big number.

Un milliard est un très grand nombre.

Noun used as a subject.

The star is a billion miles away.

L'étoile est à un milliard de miles.

Using 'a' before billion.

I see billions of stars.

Je vois des milliards d'étoiles.

Use 'billions of' for an unknown amount.

The company made one billion dollars.

L'entreprise a gagné un milliard de dollars.

One billion = 1,000,000,000.

Is a billion more than a million?

Est-ce qu'un milliard est plus qu'un million ?

Question form.

She has a billion toys!

Elle a un milliard de jouets !

Hyperbole (exaggeration).

The project will cost two billion euros.

Le projet coûtera deux milliards d'euros.

No 's' on billion after 'two'.

Billions of people use the internet.

Des milliards de personnes utilisent Internet.

Plural 'billions' with 'of'.

A billion has nine zeros.

Un milliard a neuf zéros.

Defining the number.

The movie earned over a billion dollars.

Le film a rapporté plus d'un milliard de dollars.

'Over a billion' means > 1,000,000,000.

There are billions of bacteria in our bodies.

Il y a des milliards de bactéries dans notre corps.

Scientific usage.

The sun is 4.6 billion years old.

Le soleil a 4,6 milliards d'années.

Decimal with billion.

The app was downloaded a billion times.

L'application a été téléchargée un milliard de fois.

Passive voice.

He spent a billion on the new stadium.

Il a dépensé un milliard pour le nouveau stade.

Billion as a noun representing currency.

The government announced a five-billion-dollar plan.

Le gouvernement a annoncé un plan de cinq milliards de dollars.

Compound adjective with hyphens.

The tech giant's value reached 100 billion.

La valeur du géant de la technologie a atteint 100 milliards.

Large number usage.

We need to plant billions of trees to help the Earth.

Nous devons planter des milliards d'arbres pour aider la Terre.

Plural for emphasis.

The distance is about 1.5 billion kilometers.

La distance est d'environ 1,5 milliard de kilomètres.

Measurement context.

A billion seconds is nearly 32 years.

Un milliard de secondes, c'est presque 32 ans.

Time visualization.

The company reported a billion-dollar loss this quarter.

L'entreprise a signalé une perte d'un milliard de dollars ce trimestre.

Financial reporting.

There are billions of web pages on the internet.

Il y a des milliards de pages web sur Internet.

Digital scale.

The billionaire donated half his fortune to charity.

Le milliardaire a fait don de la moitié de sa fortune à une œuvre de charité.

Related noun: billionaire.

The merger created a multi-billion-dollar corporation.

La fusion a créé une entreprise de plusieurs milliards de dollars.

Prefix 'multi-' with billion.

The light from the galaxy traveled for ten billion years.

La lumière de la galaxie a voyagé pendant dix milliards d'années.

Cosmological time.

The deficit has ballooned to over forty billion pounds.

Le déficit a gonflé à plus de quarante milliards de livres.

Economic terminology.

She has a billion things on her to-do list.

Elle a un milliard de choses sur sa liste de tâches.

Idiomatic hyperbole.

The brain has approximately 86 billion neurons.

Le cerveau possède environ 86 milliards de neurones.

Biological precision.

The investment firm manages over ten billion in assets.

La société d'investissement gère plus de dix milliards d'actifs.

Asset management context.

The social network has two billion active users.

Le réseau social compte deux milliards d'utilisateurs actifs.

User base metric.

A billion-to-one shot actually succeeded.

Une chance sur un milliard a fini par réussir.

Probability expression.

The fiscal stimulus package was worth several hundred billion.

Le plan de relance budgétaire valait plusieurs centaines de milliards.

Ellipsis (dollars is implied).

The sheer scale of the billion-dollar fraud was unprecedented.

L'ampleur même de la fraude d'un milliard de dollars était sans précédent.

Abstract noun modification.

The universe contains billions of galaxies, each with billions of stars.

L'univers contient des milliards de galaxies, chacune avec des milliards d'étoiles.

Repetition for rhetorical effect.

The transition from the long to the short scale billion was a major linguistic shift.

Le passage du milliard de l'échelle longue à l'échelle courte a été un changement linguistique majeur.

Historical context.

The company's valuation surpassed the ten-billion-dollar mark.

La valorisation de l'entreprise a dépassé la barre des dix milliards de dollars.

Metaphorical 'mark'.

The environmental impact of billions of tons of plastic is devastating.

L'impact environnemental de milliards de tonnes de plastique est dévastateur.

Mass noun usage.

He spoke with the confidence of a man who has a billion in the bank.

Il parlait avec l'assurance d'un homme qui a un milliard à la banque.

Character description.

The telescope can detect objects billions of light-years away.

Le télescope peut détecter des objets à des milliards d'années-lumière.

Scientific distance.

The geopolitical ramifications of a billion-dollar trade war are immense.

Les ramifications géopolitiques d'une guerre commerciale d'un milliard de dollars sont immenses.

Complex subject phrase.

To conceptualize a billion, one must look beyond the horizon of daily experience.

Pour conceptualiser un milliard, il faut regarder au-delà de l'horizon de l'expérience quotidienne.

Philosophical usage.

The algorithm processes billions of data points per millisecond.

L'algorithme traite des milliards de points de données par milliseconde.

High-tech precision.

The central bank's billion-dollar intervention stabilized the currency.

L'intervention d'un milliard de dollars de la banque centrale a stabilisé la monnaie.

Economic policy context.

The evolutionary history of life spans nearly four billion years.

L'histoire évolutive de la vie s'étend sur près de quatre milliards d'années.

Biological time scale.

The sheer audacity of the billion-dollar heist captured the public's imagination.

L'audace pure du hold-up d'un milliard de dollars a captivé l'imagination du public.

Literary style.

The discrepancy between the short and long scale billion can lead to profound errors.

L'écart entre le milliard de l'échelle courte et de l'échelle longue peut entraîner des erreurs profondes.

Technical nuance.

The philanthropist's billion-dollar endowment will fund research for centuries.

La dotation d'un milliard de dollars du philanthrope financera la recherche pendant des siècles.

Endowment context.

よく使う組み合わせ

billion dollars

billion people

billion years

multi-billion dollar

billion-dollar industry

billions of stars

billion-dollar valuation

one in a billion

billion-ton

billion-user

よく使うフレーズ

a billion and one

— Used to mean 'very many' plus one more for emphasis.

I have a billion and one things to do today.

one in a billion

— Extremely rare or unique.

She is a one in a billion talent.

billions of

— An unspecified, very large number.

Billions of insects live in the forest.

a billion-dollar question

— A very important or difficult question to answer.

How to solve climate change is the billion-dollar question.

parts per billion

— A unit of concentration used in science (ppb).

The toxin was measured in parts per billion.

multi-billionaire

— A person who has many billions of dollars.

The multi-billionaire bought a new island.

billion-strong

— Having a population or group of one billion.

The billion-strong nation celebrated its anniversary.

billion-fold

— Increased by a factor of a billion.

The computer's speed increased billion-fold.

the billionth

— The ordinal number corresponding to a billion.

The store welcomed its billionth customer.

billion-dollar baby

— Something very expensive or valuable (informal).

That new jet is a real billion-dollar baby.

よく混同される語

billion vs million

A million is 1,000 times smaller than a billion. It has six zeros.

billion vs trillion

A trillion is 1,000 times larger than a billion. It has twelve zeros.

billion vs milliard

This is the European term for a billion (10^9), often confused by translators.

慣用句と表現

"one in a billion"

— Something or someone that is incredibly rare and special.

A person with her kindness is one in a billion.

informal

"a billion to one"

— Used to describe something that is almost impossible.

The odds of winning that lottery are a billion to one.

neutral

"thanks a billion"

— An enthusiastic way to say thank you.

Thanks a billion for helping me move house!

informal

"feel like a billion bucks"

— To feel very healthy, happy, or confident.

After my workout, I feel like a billion bucks.

informal

"a billion and one excuses"

— Having too many reasons for not doing something.

He has a billion and one excuses for being late.

informal

"not in a billion years"

— Absolutely never.

I wouldn't go skydiving, not in a billion years!

informal

"a billion-dollar smile"

— A very attractive and charming smile.

The actor greeted the fans with a billion-dollar smile.

informal

"look like a billion dollars"

— To look extremely good or expensive.

She looked like a billion dollars in that gown.

informal

"spend a billion"

— To spend a lot of time or effort on something.

I spent a billion hours on this painting.

informal

"a billion-dollar idea"

— An idea that has the potential to be very successful.

He thinks he has a billion-dollar idea for a new app.

neutral

間違えやすい

billion vs million

Phonetically similar and both represent large numbers.

A billion is a thousand millions. The difference is 999 million.

A million seconds is 11 days; a billion seconds is 31 years.

billion vs trillion

Next in the sequence and sounds similar.

A trillion is a thousand billions.

The company is worth a billion, but the country's debt is in trillions.

billion vs billionaire

Related but different part of speech.

Billion is the number; billionaire is the person who has that much money.

He is a billionaire with ten billion dollars.

billion vs milliard

It means the same thing but is used in different languages.

English uses 'billion' for 10^9; French/German use 'milliard'.

In Germany, they say 'eine Milliarde' for what we call a billion.

billion vs zillion

Sounds like a real number.

Zillion is fake/informal; billion is a real mathematical value.

Don't use zillion in a math test!

文型パターン

There are [number] billion [noun].

There are 8 billion people.

[Noun] costs [number] billion.

The bridge costs one billion.

A [number]-billion-dollar [noun].

A five-billion-dollar project.

Billions of [noun] are [verb].

Billions of stars are visible.

The [noun] reached the [number]-billion mark.

The valuation reached the ten-billion mark.

Given the [adjective] scale of [number] billion...

Given the immense scale of fifty billion...

It is worth over [number] billion.

It is worth over two billion.

I have [number] billion [noun].

I have a billion ideas.

語族

名詞

動詞

形容詞

使い方

frequency

Very common in news, finance, and science.

よくある間違い

Five billions dollars → Five billion dollars
Do not pluralize 'billion' when it follows a specific number.
A billion of people → A billion people
Do not use 'of' after 'billion' if it is preceded by 'a' or a number.
Confusing billion with million → Check the context and zeros
A billion is 1,000 times larger than a million.
Using 'billion' for 10^12 in English → Use 'trillion'
In modern English, 10^12 is a trillion, not a billion.
Writing 1,000,000 for a billion → 1,000,000,000
A billion must have nine zeros, not six.

ヒント

Singular vs Plural

Never add an 's' if there's a number before it. Say 'seven billion', not 'seven billions'.

The 'B' Sound

Make the 'B' sound very strong to distinguish it from 'million'. Your lips should pop.

Hyphenation

Use a hyphen when 'billion' is part of a compound adjective before a noun, like 'billion-dollar deal'.

Global Scale

Use 'billion' when talking about world population or global economics to sound more natural.

Zero Count

Remember: Million has 6 zeros, Billion has 9, Trillion has 12. They go up by threes.

Hyperbole

In casual talk, you can use 'a billion' to mean 'a lot', but don't do this in formal reports.

Abbreviations

In finance, '$1B' is the standard way to write one billion dollars quickly.

Visualization

To understand the size, remember that a billion is a thousand times bigger than a million.

Scale Check

If working with European partners, clarify if they mean 10^9 or 10^12 when they say 'billion'.

News Context

When you hear 'billion' in the news, it's almost always about money, people, or time.

暗記しよう

記憶術

B is for Big. A Billion is Big, and it has 9 zeros (think of the 9 in 'bi-llion' as looking like a small 'b').

視覚的連想

Imagine a cube made of 1,000 smaller cubes. If each small cube is a million, the whole big cube is a billion.

Word Web

money population stars zeros billionaire trillion million scale

チャレンジ

Try to find three news headlines today that use the word 'billion'. Write them down and check if they use it with a specific number or as 'billions of'.

語源

The word 'billion' originated in the late 15th century, formed from the prefix 'bi-' (meaning two) and the word 'million'. It was coined by French mathematicians to represent a million squared (10 to the 12th power).

元の意味： Originally, it meant a million millions (the long scale).

Indo-European, via French.

文化的な背景

Be careful when discussing 'billions' in the context of poverty or national debt, as the scale can be sensitive.

In the US and UK, 'billion' always means 1,000,000,000 in modern contexts.

The movie 'The Social Network' (A billion dollars isn't cool. You know what's cool? A trillion dollars.) Carl Sagan's famous (though misquoted) 'billions and billions' of stars. The song 'Billionaire' by Travie McCoy and Bruno Mars.

実生活で練習する

実際の使用場面

Economics

billion-dollar deficit
market cap of 50 billion
billion-euro investment
global trade worth billions

Science

billions of light-years
four billion years old
billions of cells
parts per billion

Demographics

eight billion people
billion-strong population
billions of inhabitants
reaching the billion mark

Technology

billions of transistors
gigabytes of data
billion-user platform
billions of searches

Daily Life (Hyperbole)

a billion times
billion things to do
thanks a billion
one in a billion

会話のきっかけ

"Do you think the world population will ever reach ten billion?"

"If you had a billion dollars, what is the first thing you would buy?"

"Why do you think it is so hard for humans to imagine how big a billion really is?"

"Do you know any companies that are worth more than a hundred billion dollars?"

"How many billion years old do you think the universe is?"

日記のテーマ

Imagine you are a billionaire. Describe your typical day and how you would use your money to help the world.

Write about a time you felt like you had 'a billion things to do'. How did you manage your time?

Research a scientific fact involving the number billion (like the number of stars or neurons) and explain why it fascinates you.

Discuss the pros and cons of a world with eight billion people. What are the biggest challenges?

If you could spend one billion dollars on a single project, what would it be and why?

よくある質問

10 問

In the standard short scale used in English, a billion has nine zeros: 1,000,000,000. It is a thousand million.

Yes, since 1974, the UK has officially used the same 'short scale' as the US, where a billion is 1,000,000,000.

They represent the same number (10^9). 'Billion' is the English term, while 'milliard' is used in many other European languages.

A billion is written as 10^9.

When used with a specific number, 'billion' acts as a unit and stays singular. When used generally, it acts as a plural noun.

In the short scale, the next major unit is a trillion (1,000,000,000,000).

In the 'long scale' (used historically in the UK and still in some other countries), yes. But in modern English, it is a thousand million.

If you counted one number per second without stopping, it would take about 31.7 years.

A billionaire is a person who possesses assets or net worth of at least one billion units of a currency, such as dollars or pounds.

It is an idiom used to describe something that is extremely rare, unique, or special.

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