in a circle whose radius is unity, the sine of the arc that measures the angle; in a right-angled triangle, the side opposite the given angle divided by the hypotenuse. See Trigonometrical function, under Function.

See also: Sine

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

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References in periodicals archive

We now know that the sine of an angle is well defined.

(When the altitude is outside of the triangle, one will need to use the fact that sin (180[degrees] - A) = sin A to prove the result, and this easily follows from the definition of the sine of an angle.) If we draw an altitude to side AB and proceed similarly, we obtain

An ordinary but surprisingly powerful theorem

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Sine of an angle