Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “sine”

sine

noun [C]  /sɑɪn/ (abbreviation sin) us  
trigonometry in a triangle that has one angle of 90°, the ratio (= relationship) of the length of the side opposite an angle less than 90° divided by the length of the hypotenuse (= the side opposite the 90° angle)
(Definition of sine from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of sine?
Add Cambridge dictionaries to your browser to your website

Definitions of “sine” in other dictionaries

Word of the Day

bitter

a type of dark brown beer with a bitter taste

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More