'Complementary' definitions:

Definition of 'complementary'

From: WordNet
adjective
Of words or propositions so related that each is the negation of the other; "`male' and `female' are complementary terms"
adjective
Acting as or providing a complement (something that completes the whole) [syn: complemental, complementary, completing]
noun
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" [syn: complementary color, complementary]

Definition of 'Complementary'

From: GCIDE
  • Complementary \Com`ple*men"ta*ry\, a. Serving to fill out or to complete; as, complementary numbers. [1913 Webster]
  • Complementary colors. See under Color.
  • Complementary angles (Math.), two angles whose sum is 90[deg]. [1913 Webster]

Definition of 'Complementary'

From: GCIDE
  • Complementary \Com`ple*men"ta*ry\, n. [See Complimentary.] One skilled in compliments. [Obs.] --B. Jonson. [1913 Webster]