Definition of "Complement" :

noun: something added to complete or embellish or make perfect

"A fine wine is a perfect complement to the dinner."

noun: either of two parts that mutually complete each other

noun: a word or phrase used to complete a grammatical construction

noun: number needed to make up a whole force

"A full complement of workers."

noun: a complete number or quantity

"A full complement."

noun: one of a series of enzymes in the blood serum that are part of the immune response

verb: make complete or perfect; supply what is wanting or form the complement to

"I need some pepper to complement the sweet touch in the soup."