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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Com·ple·men·ta·ry a. Serving to fill out or to complete; as, complementary numbers.
 Complementary colors. See under Color.
 Complementary angles Math., two angles whose sum is 90°.

From: WordNet (r) 2.0

 complementary angles
      n : two angles whose sum is a right angle