Adjective complementary has 3 senses
  1. complemental, complementary, completing - acting as or providing a complement (something that completes the whole)
    Antonym: essential (indirect, via inessential)
  2. complementary - of words or propositions so related that each is the negation of the other; "`male' and `female' are complementary terms"
    Antonym:
    synonymous (indirect, via antonymous)
  3. complementary, interchangeable, reciprocal - of or relating to or suggestive of complementation; "interchangeable electric outlets"
    Antonym: nonreciprocal (indirect, via reciprocal)
,Noun complementary has 1 sense
  1. complementary color, complementary - either one of two chromatic colors that when mixed together give white (in the case of lights) or gray (in the case of pigments); "yellow and blue are complementaries"
    --1 is a kind of chromatic color, chromatic colour, spectral color, spectral colour
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