Word.ws English Dictionary

cosine

UK/ˈkəʊ.saɪn//ˈkoʊ.saɪn/

cosine 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.

cosine: in a right triangle, the ratio of the length of the side adjacent to an acute angle to the length...
Image: Geek3, Public domain, via Wikimedia Commons

Noun

cosine (plural cosines)

  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

cosine meaning in Tamil, Bengali, Gujarati and Tagalog

cosine in Tamil

trigonometric function
துணைசெவ்வளை tuṇaicevvaḷai

cosine in Bengali

ত্রিকোণমিতির একটি ফাংশন

cosine in Gujarati

cosine
કોટિજ્યા koṭijyā

cosine in Tagalog

trigonometric function
kasinway
More languagesFewer languages
cosine in Arabic
جَيْب تَمَام jayb tamām
cosine in Malay
kosinus
cosine in Thai
โคไซน์ koo-saai
cosine in Vietnamese
côsin
cosine in Myanmar
ကိုဆိုင်း kuihcuing:

Forms of cosine

pluralcosines

Plural of cosine: cosines

Origin of cosine

From co- + sine, short for complementi sinus in Latin, meaning “sine of the complement”. Doublet of cosinus.

Words formed from cosine

Phrases with cosine

Questions about cosine

What does cosine mean?
Cosine means 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.
What is cosine in Tamil?
Cosine in Tamil is துணைசெவ்வளை (tuṇaicevvaḷai). See Cosine meaning in Tamil.
What part of speech is cosine?
Cosine is a noun.
How do you pronounce cosine?
Cosine is pronounced /ˈkəʊ.saɪn/ (UK).
What is the plural of cosine?
The plural of cosine is cosines.

Words near cosine in the dictionary

  1. cosimulation
  2. cosimulations
  3. Cosin
  4. cosinage
  5. cosinages
  6. cosine
  7. cosine curve
  8. cosine curves
  9. cosine formula
  10. cosine law
  11. cosine rule

Source and license

Adapted from Wiktionary: cosine (page history and authors); cosine (Bengali Wiktionary) (page history and authors); કોટિજ્યા (Gujarati) (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Vininn126-cosine.wav.

Cite this entry: “cosine.” Word.ws, https://word.ws/cosine. Based on Wiktionary, CC BY-SA 4.0.