# Sine Definition

sīn

other

The ordinate of the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length

*x*and measured counterclockwise from the point (1, 0) if*x*is positive or clockwise if*x*is negative.American Heritage Science

A function of a number

*x*, equal to the sine of an angle whose measure in radians is equal to*x.*American Heritage Science

noun

The reciprocal of the cosecant.

Webster's New World

In a right triangle, the ratio of the length of the side opposite an acute angle to the length of the hypotenuse.

American Heritage

Synonyms:

preposition

Without.

Webster's New World

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## Other Word Forms of Sine

### Noun

Singular:

sine
Plural:

sines## Origin of Sine

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