English Explanatory Dictionary

cosine

English dictionary entry

Meanings

noun

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

Pronunciation

/ˈkəʊ.saɪn/ /ˈkoʊ.saɪn/ LL-Q1860 (eng)-Vininn126-cosine.wav /ˈkəʉ.sɑɪn/

Word forms

cosine cosines

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.

Related words

Derived words

anticosine coshine cosine curve cosine formula cosine law cosine rule coversed cosine Fourier cosine series hyperbolic cosine inverse cosine Lambert's cosine law versed cosine

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