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1 a thing that contributes extra features to something else so as to enhance or improve it.
2 the number or quantity that makes something complete: we have a full complement of staff.
3Grammara word, phrase, or clause governed by a verb that completes the meaning of the predicate.
■ an adjective or noun that has the same reference as either the subject or object (as mad in he is mad or he drove her mad).
4Physiologya system of proteins present in blood plasma which combines with antigen–antibody complexes and phagocytes to bring about the destruction of microorganisms and foreign cells.
5Geometrythe amount by which a given angle is less than 90°.
▶verb/ˈkɒmplɪmɛnt/ add to (something) in a way that enhances or improves.
– derivatives complemental adjective.
– originME (in the sense ‘completion’): from L.complementum, from complere (see complete).
usage: Complement and compliment (together with related words such as complementary and complimentary) are frequently confused. Complement means ‘add to in a way that enhances or improves’, while compliment means ‘politely congratulate or praise’.