Meaning : Either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments).
Example :
Yellow and blue are complementaries.
Synonyms : complementary color
Meaning : Of words or propositions so related that each is the negation of the other.
Example :
`male' and `female' are complementary terms.
Meaning : Acting as or providing a complement (something that completes the whole).
Synonyms : complemental, completing