# cosine

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## cosine

a mathematical term

**Not to be confused with:**

cosign – to sign a document jointly with another; to endorse, as for a mortgage: his father cosigned the loan on his new car

Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

## co·sine

(kō′sīn′)*n.*

*Abbr.*

**cos**

**1.**In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse.

**2.**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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## cosine

(ˈkəʊˌsaɪn)(of an angle)

*n* (Mathematics) 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. Abbreviation:

**cos**[C17: from New Latin

*cosinus;*see co-, sine^{1}]Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## co•sine

(ˈkoʊ saɪn)*n.*

**a.**(in a right triangle) the ratio of the side adjacent to a given angle to the hypotenuse.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

## co·sine

(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 American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonyms

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Noun | 1. | cosine - ratio of the adjacent side to the hypotenuse of a right-angled trianglecircular function, trigonometric function - function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle |

Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

Translations

**cosinus**

**kosinus**

**kosini**

**コサイン**

**余弦**

**cosinus**

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

## cosine

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007

Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995

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