Plural of complementary; multiple things that complement each other or serve complementary functions.
Plural form of complementary (a thing that completes or supplements), derived from complement. This noun form developed as speakers needed to refer to pairs or groups of complementary items.
In color theory and design, 'complementaries' are opposite colors on the color wheel—red and cyan, yellow and blue—and artists discovered that mixing complementaries creates gray, which seems like destruction but is actually balance.
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