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[kong-groo-uh nt, kuh n-groo-, kuh ng-] /ˈkɒŋ gru ənt, kənˈgru-, kəŋ-/
agreeing; accordant; congruous.
Mathematics. of or relating to two numbers related by a congruence.
Geometry. coinciding at all points when superimposed:
congruent triangles.
Origin of congruent
late Middle English
1375-1425; late Middle English < Latin congruent- (stem of congruēns, present participle of congruere to come together, fit in, agree), equivalent to con- con- + -gru- base of uncertain meaning (attested only in this v. and ingruere to fall upon) + -ent- -ent
Related forms
congruently, adverb
noncongruent, adjective
noncongruently, adverb
Can be confused Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for congruent


agreeing; corresponding; congruous
having identical shapes so that all parts correspond: congruent triangles Compare similar (sense 2)
of or concerning two integers related by a congruence
Derived Forms
congruently, adverb
Word Origin
C15: from Latin congruere to meet together, agree
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
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Word Origin and History for congruent

early 15c., "suitable, proper," from Latin congruentem (nominative congruens) "agreeing, fit, suitable," present participle of congruere, literally "to come together, agree, correspond with," from com- "with" (see com-) + a lost verb *gruere, *ruere "fall, rush," perhaps from PIE *ghrei- "to rub, grind" (see chrism). Geometry sense attested by 1706.

Online Etymology Dictionary, © 2010 Douglas Harper
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congruent in Science
  (kŏng'gr-ənt, kən-gr'ənt)   
Relating to geometric figures that have the same size and shape. Two triangles are congruent, for example, if their sides are of the same length and their internal angles are of the same measure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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