- (in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.
- the sine of the complement of a given angle or arc. Abbreviation: cos
Examples from the Web for cosine
And, seating himself beside Dirrik, he began to explain the mysteries of sine, cosine and tangent.Dry Fish and Wet|Anthon Bernhard Elias Nilsen
The sine and the cosine I shall have occasion to employ in the latter part of my lecture.
Here then was the sine of an arc which did not recognize equality in the cosine of its supplement.The Army Mule and Other War Sketches|Henry A. Castle
Nevertheless, I bear no grudge against the sine and the cosine, which I continue to hold in high esteem.The Life of the Fly|J. Henri Fabre
Integrators were of three kinds: radius machines; cosine machines; tangent machines.