corollary

American  

[kawr-uh-ler-ee, kor-, kuh-rol-uh-ree] / ˈkɔr əˌlɛr i, ˈkɒr-, kəˈrɒl ə ri /

noun

plural

corollaries

1. Mathematics. a proposition that is incidentally proved in proving another proposition.

2. an immediate consequence or easily drawn conclusion.

3. a natural consequence or result.

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corollary British  

/ kəˈrɒlərɪ /

noun

1. a proposition that follows directly from the proof of another proposition

2. an obvious deduction

3. a natural consequence or result

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adjective

1. consequent or resultant

corollary Scientific  

/ kôr′ə-lĕr′ē /

1. A statement that follows with little or no proof required from an already proven statement. For example, it is a theorem in geometry that the angles opposite two congruent sides of a triangle are also congruent. A corollary to that statement is that an equilateral triangle is also equiangular.

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Etymology

Origin of corollary

1325–75; Middle English < Late Latin corollārium corollary, in Latin: money paid for a garland, a gift, gratuity. See corolla, -ary

Example Sentences

If, as the old saying goes, “all politics is local,” then the modern-day corollary in an era of smartphones is, “all conflict is global.”

From Los Angeles Times • Mar. 18, 2026

The corollary is lower sales, thinner margins and smaller corporate profits.

From Barron's • Feb. 20, 2026

A corollary of Erb’s investment lesson is that when an asset that previously deviated from fair value eventually returns towards fair value, there is no guarantee that it will stop once it gets there.

From MarketWatch • Feb. 10, 2026

The old maxim “Buy low, sell high” has a cash-flow corollary: “Collect early, pay late.”

From The Wall Street Journal • Jan. 14, 2026

He knew, for example, that it was called paramnesia, and he was interested as well in such corollary optical phenomena as jamais vu, never seen, and presque vu, almost seen.

From "Catch-22" by Joseph Heller

Related Words

• analogy
• upshot