Noun
1. a word or phrase used to complete a grammatical construction
2. a complete number or quantity;
"a full complement"3. number needed to make up whole force;
"a full complement of workers"4. something added to complete or make perfect;
"a fine wine is a perfect complement to the dinner"5. one of a series of enzymes in the blood serum that are part of the immune response
6. either of two parts that mutually complete each other