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cosine

[koh-sahyn]

Origin

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noun

Trigonometry.

(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

Mathematics. (of a real or complex number x) the function cos x defined by the infinite series 1 − (x²/2!) + (x⁴/4!) − + …, where ! denotes factorial. Abbreviation: cos Compare sine (def. 3), factorial (def. 1).

Origin:
1625–35; < Neo-Latin cosinus. See co-, sine¹

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cosine is always a great word to know.

So is zedonk. Does it mean:

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

the offspring of a zebra and a donkey.

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Collins

World English Dictionary

cosine (ˈkəʊˌsaɪn)

—n
	cos a trigonometric function that in a right-angled triangle is the ratio of the length of the adjacent side to that of the hypotenuse; the sine of the complement

[C17: from New Latin cosinus; see co-, sine¹]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline

Word Origin & History

cosine

1630s, from co- + sine.

American Heritage

Science Dictionary

cosine (kō'sīn') Pronunciation Key

The ratio of the length of the side adjacent to an acute angle of a right triangle to the length of the hypotenuse.
The abscissa of 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.
A function of a number x, equal to the cosine of an angle whose measure in radians is equal to x.

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Computing Dictionary

COSINE definition

Cooperation for Open Systems Interconnection Networking in Europe. A EUREKA project.

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cosine

co·sine

COSINE definition