Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A trigonometric function of an angle equal to one minus the cosine of that angle. Also called versine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The trigonometric function 1 − cos(x).

from the GNU version of the Collaborative International Dictionary of English

  • adj. See under Sine, and Illust. of Functions.
  • n. that part of the diameter between the sine and the arc.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Translation of New Latin sinus versus : sinus, sine + Latin versus, past participle of vertere, to turn.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin sinus versus ("flipped sine"); the sine function being sometimes called sinus rectus.

Examples

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