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corollary

[kawr-uh-ler-ee, kor-; especially Brit., kuh-rol-uh-ree]

Origin

noun, plural -lar·ies.

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

an immediate consequence or easily drawn conclusion.

a natural consequence or result.

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

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Corollary is always a great word to know.

So is interrobang. Does it mean:

a fool or simpleton; ninny.

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

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Collins

World English Dictionary

corollary (kəˈrɒlərɪ)

—n , pl -laries
1.	a proposition that follows directly from the proof of another proposition
2.	an obvious deduction
3.	a natural consequence or result

—*adj*
4.	consequent or resultant

[C14: from Latin corollārium money paid for a garland, from Latin corolla garland, from corōnacrown]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline

Word Origin & History

corollary

late 14c., from L.L. corollarium "a deduction, consequence," from L. corollarium, originally "money paid for a garland," hence "gift, gratuity, something extra," from corolla "small garland," dim. of corona "crown."

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Science Dictionary

corollary

(kôr'ə-lěr'ē) Pronunciation Key
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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Related Words

Roosevelt Corollary attendant

coroll Gödel's incompleteness theorem

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corollary

cor·ol·lar·y