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

noun, plural cor·ol·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 of corollary

1325–75; Middle English < Late Latin corollārium corollary, in Latin: money paid for a garland, a gift, gratuity. See corolla, -ary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for corollary

Contemporary Examples of corollary

Historical Examples of corollary

  • He could turn back; he must turn back; and as a corollary the Leopard Woman must turn back with him!

    The Leopard Woman

    Stewart Edward White

  • I waited for the corollary, “and been loved in return,” but it did not come.

    The First Violin

    Jessie Fothergill

  • The corollary is equally true: in order to eat it is necessary to pay.

    The Wall Street Girl

    Frederick Orin Bartlett

  • The love of liberty is the corollary of the right of consent to government.

  • "The Doss-house" is at most the corollary of this revolution.

    Maxim Gorki

    Hans Ostwald

British Dictionary definitions for corollary


noun plural -laries

a proposition that follows directly from the proof of another proposition
an obvious deduction
a natural consequence or result


consequent or resultant

Word Origin for corollary

C14: from Latin corollārium money paid for a garland, from Latin corolla garland, from corōna crown
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for corollary

late 14c., from Late Latin corollarium "a deduction, consequence," from Latin corollarium, originally "money paid for a garland," hence "gift, gratuity, something extra;" and in logic, "a proposition proved from another that has been proved." From corolla "small garland," diminutive of corona "crown" (see crown (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper

corollary in Science



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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.