Read the dictionary definition of complementary. All definitions for this word.
1. either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments)
1. yellow and blue are complementaries
2. acting as or providing a complement (something that completes the whole)
3. of words or propositions so related that each is the negation of the other
1. `male' and `female' are complementary terms