Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Two angles whose sum is 90°.
Wiktionary
- n. geometry A pair of angles that sum to a right angle.
GNU Webster's 1913
- adj. (Math.) two angles whose sum is 90°.
WordNet 3.0
- n. two angles whose sum is a right angle
Etymologies
- Complementary in the sense of completing, i.e. they form a complete right angle. (Wiktionary)
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