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Vinony

cosine

noun

  1. trigonometric function; ratio between the lengths of the adjacent side and the hypotenuse in a right triangle
L30872 on Wikidata ↗

Wiktionary

Pronunciation: /ˈkəʊ.saɪn/ / /ˈkoʊ.saɪn/ / /ˈkəʉ.sɑɪn/

noun

Etymology: Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-der. English co- Proto-Indo-European *sinos Proto-Italic *sinus Latin sinusbor. English sine English cosine From co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.

  1. In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos