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cotangent

[koh-tan-juh nt, koh-tan-] /koʊˈtæn dʒənt, ˈkoʊˌtæn-/
noun, Trigonometry.
1.
(in a right triangle) the ratio of the side adjacent to a given angle to the side opposite.
2.
the tangent of the complement, or the reciprocal of the tangent, of a given angle or arc.
Abbreviation: cot, ctn.
Also, cotan
[koh-tan] /ˈkoʊˌtæn/ (Show IPA)
.
Origin of cotangent
1625-1635
First recorded in 1625-35, cotangent is from the New Latin word cotangent- (stem of cotangēns). See co-, tangent
Related forms
cotangential
[koh-tan-jen-shuh l] /ˌkoʊ tænˈdʒɛn ʃəl/ (Show IPA),
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cotangent

cotangent

/kəʊˈtændʒənt/
noun
1.
(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 opposite side; the reciprocal of tangent Abbreviation cot, cotan, ctn
Derived Forms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cotangent
n.

from co. tangent, abbreviation of complement + tangent.

Online Etymology Dictionary, © 2010 Douglas Harper
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cotangent in Science
 cotangent   (kō-tān'jənt)    The ratio of the length of the adjacent side of an acute angle in a right triangle to the length of the opposite side. The cotangent is the inverse of the tangent.The ratio of the ordinate to 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 cotangent of an angle whose measure in radians is equal to x.
The American Heritage® Science Dictionary