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British Dictionary definitions for complementary colour

complementary colour

noun
  1. one of any pair of colours, such as yellow and blue, that give white or grey when mixed in the correct proportions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012