Nouns

(n)complementa word or phrase used to complete a grammatical construction
(n)complementa complete number or quantity“a full complement”
(n)complement, full complementnumber needed to make up a whole force“a full complement of workers”
(n)complement, accompanimentsomething added to complete or embellish or make perfect“a fine wine is a perfect complement to the dinner”, “wild rice was served as an accompaniment to the main dish”
(n)complementone of a series of enzymes in the blood serum that are part of the immune response
(n)complementeither of two parts that mutually complete each other

Verbs

(v)complementmake complete or perfect; supply what is wanting or form the complement to“I need some pepper to complement the sweet touch in the soup”