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complementary

[ kom-pluh-men-tuh-ree, -tree ]
/ ˌkɒm pləˈmɛn tə ri, -tri /
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adjective

forming a complement; completing.
complementing each other.

noun, plural com·ple·men·ta·ries.

QUIZZES

QUIZ YOURSELF ON “THEIR,” “THERE,” AND “THEY’RE”

Are you aware how often people swap around “their,” “there,” and “they’re”? Prove you have more than a fair grasp over these commonly confused words.
Question 1 of 7
Which one of these commonly confused words can act as an adverb or a pronoun?

Origin of complementary

First recorded in1590–1600; complement + -ary

OTHER WORDS FROM complementary

com·ple·men·ta·ri·ness, nounun·com·ple·men·ta·ry, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for complementary

British Dictionary definitions for complementary

complementary

complemental

/ (ˌkɒmplɪˈmɛntərɪ, -trɪ) /

adjective

acting as or forming a complement; completing
forming a satisfactory or balanced whole
forming a mathematical complementsine and cosine are complementary functions
maths logic (of a pair of sets, etc) mutually exclusive and exhaustive, each being the complement of the other
(of genes) producing an effect in association with other genes
involving or using the treatments and techniques of complementary medicine

Derived forms of complementary

complementarily or complementally, adverbcomplementariness, noun
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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