Speakur

Word Pronunciation & Dictionary

cosine

/ˈkoʊ.saɪn/

Word Rarity Rare

Frequency: Zipf frequency 2.51 in modern English

Syllables
co-sine
IPA
/ˈkoʊ.saɪn/
8
Scrabble Score
6
Letters
2
Syllables
6
Unique Chars

Meaning

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

Etymology

Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-lbor. 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.

Word Breakdown

Regional Pronunciation

  • American English: /ˈkoʊ.saɪn/
  • British English: /ˈkəʊ.saɪn/

Inflected Forms

cosines (plural)

Derived Forms

anticosine coshine

Phrases

cosine curve cosine formula cosine law cosine rule coversed cosine Fourier cosine series hyperbolic cosine inverse cosine

Frequently Paired Words

arccosine sine power series secant tangent trigonometry

Synonyms

cos

Homonyms

cosign

Questions

How do you pronounce cosine?
The recorded pronunciation is /ˈkoʊ.saɪn/.
What does cosine mean?
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
Where does cosine come from?
Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-lbor. 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.

How to pronounce cosine

  1. Open the pronunciation page — Open the Speakur entry for “cosine”.
  2. Read the phonetic spelling — Read the IPA spelling (/ˈkoʊ.saɪn/) so you know which sounds to aim for.
  3. Play the audio — Click Play to hear reference audio for “cosine”.
  4. Repeat and practice — Say “cosine” aloud, matching stress and vowels until it feels natural.