Meaning of “complement” in the English Dictionary

"complement" in British English

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complementverb [ T ]

uk /ˈkɒm.plɪ.ment/ us /ˈkɑːm.plə.ment/

complementnoun

uk /ˈkɒm.plɪ.ment/ us /ˈkɑːm.plə.ment/

(Definition of “complement” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"complement" in American English

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complementverb [ T ]

us /ˈkɑm·pləˌment/

to help make something or someone more complete or effective:

She used photographs to complement the text of the news story.
complementary
adjective us /ˌkɑm·pləˈmen·tə·ri, -tri/

This ancient Chinese therapy is part of the complementary treatment program for pain.

complementnoun [ C ]

us /ˈkɑm·plə·mənt/

A complement is a number of people or things that makes something complete:

We had a full complement of reporters and photographers along.

grammar A complement is part of a word or phrase that completes the predicate (= the part of a sentence that gives information about the subject), as “nothing” in “They told him nothing.”

(Definition of “complement” from the Cambridge Academic Content Dictionary © Cambridge University Press)