from The American Heritage® Dictionary of the English Language, 4th 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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)
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle
Sorry, no etymologies found.