from The American Heritage® Dictionary of the English Language, 4th Edition
- n. In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.
- n. The abscissa at the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos
from the GNU version of the Collaborative International Dictionary of English
- n. The sine of the complement of an arc or angle. See Illust. of functions.
from The Century Dictionary and Cyclopedia
- n. In trigonom., the sine of the complement of a given angle (whose cosine it is).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. ratio of the adjacent side to the hypotenuse of a right-angled triangle
Sorry, no etymologies found.