cosine

[ koh-sahyn ]

/ ˈkoʊ saɪn /

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: cosCompare sine (def. 3), factorial (def. 1).

Origin of cosine

1625–35; <New Latin cosinus. See co-, sine

Words nearby cosine

cosign, cosignatory, cosigner, Cosimo, Cosimo I, cosine, COSLA, cos lettuce, cosm-, cosmeceutical, Cosmegen

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences 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.
Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886|Various
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.
Scientific American Supplement, No. 315, January 14, 1882|Various

British Dictionary definitions for cosine

cosine

/ (ˈkəʊˌsaɪn) /

noun (of an angle)

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 complementAbbreviation: cos

Word Origin for cosine

C17: from New Latin cosinus; see co-, sine 1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for cosine

cosine

[ kō′sīn′ ]

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.

单词	cosine
释义	cosine [ koh-sahyn ] / ˈkoʊ saɪn / 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: cosCompare sine (def. 3), factorial (def. 1). Origin of cosine 1625–35; <New Latin cosinus. See co-, sine Words nearby cosine cosign, cosignatory, cosigner, Cosimo, Cosimo I, cosine, COSLA, cos lettuce, cosm-, cosmeceutical, Cosmegen Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences 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. Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886\|Various 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. Scientific American Supplement, No. 315, January 14, 1882\|Various British Dictionary definitions for cosine cosine / (ˈkəʊˌsaɪn) / noun (of an angle) 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 complementAbbreviation: cos Word Origin for cosine C17: from New Latin cosinus; see co-, sine 1 Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for cosine cosine [ kō′sīn′ ] 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. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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