complementary
1. [ adjective ] acting as or providing a complement (something that completes the whole)
Synonyms: completing complemental
Related terms: inessential
2. [ noun ] (color) either one of two chromatic colors that when mixed together give white (in the case of lights) or gray (in the case of pigments)
Synonyms: complementary_color
Examples:

"yellow and blue are complementaries"

Related terms: chromatic_color
3. [ adjective ] of words or propositions so related that each is the negation of the other
Examples:

"`male' and `female' are complementary terms"

Related terms: antonymous
4. [ adjective ] of or relating to or suggestive of complementation
Synonyms: interchangeable reciprocal
Examples:

"interchangeable electric outlets"

Related terms: reciprocal
Similar spelling:   complement
  complementarity
  complimentary
  complemental
  complementation
  compliment
  complexity
  completely
  complacent
  compliments
  complacently
  complexion
  completion
  completing
  complection