A word or group of words that completes the meaning of a predicate.
In the sentence 'She is a teacher,' the word 'teacher' is a complement.
The quantity or number needed to make up a whole.
The ship's complement was 200 sailors.
A counterpart or equivalent.
The new software is a complement to the existing system.
In mathematics, the set of all elements in a universal set that are not members of a given subset, or the angle that together with a given angle equals 90 degrees.
The complement of a 40-degree angle is 50 degrees.
In immunology, a group of proteins in blood plasma that, when activated, enhance the body's immune response by assisting antibodies in destroying pathogens.
Activation of the complement led to rapid destruction of the invading bacteria.
complementverb
To complete, enhance, or bring to perfection by providing what is lacking.
The bright cushions complement the neutral tones of the sofa.