definitions
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# cotangent

[koh-tan-juh nt, koh-tan-]
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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 co·tan [koh-tan] /ˈkoʊˌtæn/.

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First recorded in 1625–35, cotangent is from the New Latin word cotangent- (stem of cotangēns). See co-, tangent
Related formsco·tan·gen·tial [koh-tan-jen-shuh l] /ˌkoʊ tænˈdʒɛn ʃəl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for cotan

abbreviation for
1. cotangent

# cotangent

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 tangentAbbreviation: cot, cotan, ctn
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

# cotangent

### n.

from co. tangent, abbreviation of complement + tangent.