versin

versed sine

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


Origin:
1590–1600

Dictionary.com Unabridged

ver·sine

[vur-sahyn]
noun Trigonometry.
Also, ver·sin.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Versin is always a great word to know.
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a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
versed sine
 
n
vers a trigonometric function equal to one minus the cosine of the specified angle
 
[C16: from New Latin sinus versus, from sine1 + versus turned, from vertere to turn]

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