American Heritage® Dictionary of the English Language, Fourth Edition
- n. A function of an angle expressed as the ratio of two of the sides of a right triangle that contains that angle; the sine, cosine, tangent, cotangent, secant, and cosecant. Also called circular function.
- n. trigonometry Any function of an angle expressed as the ratio of two of the sides of a right triangle that has that angle, or various other functions that subtract 1 from this value or subtract this value from 1 (such as the versed sine)
- n. function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
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