complementary
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(s) of words or propositions so related that each is the negation of the other
- "male" and "female" are complementary terms
- (s) acting as or providing a complement (something that completes the whole) complemental, completing,
Nouns
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(n) either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments)
- yellow and blue are complementaries