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versed sine

noun, Trigonometry
1.
one minus the cosine of a given angle or arc.
Abbreviation: vers.
Also called versine, versin.
Origin
1590-1600
1590-1600

versine

[vur-sahyn] /ˈvɜr saɪn/
noun, Trigonometry
Also, versin.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for versin

versed sine

noun
1.
a trigonometric function equal to one minus the cosine of the specified angle vers
Word Origin
C16: from New Latin sinus versus, from sine1 + versus turned, from vertere to turn
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
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