Definition of sine in English:

Share this entry


Pronunciation: /sīn/


The trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.
Example sentences
  • It presents a one-point iterative technique for calculating the sine of a given angle.
  • This same table was reproduced in the work of Brahmagupta and detailed method for constructing a table of sines for any angle were give by Bhaskara in 1150.
  • If you use the distance along the ground, you have to find the vertical component by multiplying by the sine of the angle of the hill in both the distance and acceleration terms.


Late 16th century: from Latin sinus 'curve', used in medieval Latin as a translation of Arabic jayb 'pocket, sine'.

  • insinuate from early 16th century:

    This word was first used in legal contexts in the sense ‘enter (a document) on the official register’. Latin insinuare ‘introduce tortuously’ is the source, from in- ‘in’ and sinuare ‘to curve’, from sinus ‘a bend’ found in the sine of mathematics, sinuous, and the sinus (all late 16th century). Nearly all the English senses were already in Latin.

Words that rhyme with sine

align, assign, benign, brine, chine, cline, combine, condign, confine, consign, dine, divine, dyne, enshrine, entwine, fine, frontline, hardline, interline, intertwine, kine, Klein, line, Main, malign, mine, moline, nine, on-line, opine, outshine, pine, Rhein, Rhine, shine, shrine, sign, spine, spline, stein, Strine, swine, syne, thine, tine, trine, twine, Tyne, underline, undermine, vine, whine, wine

For editors and proofreaders

Syllabification: sine

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.