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

  • Medieval Latin sinus (mistranslation of Arabic jayb sine) (as if jayb fold in a garment) from Latin curve, fold

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin sinus, originally by mistranslation of Arabic جب (jubb). Ultimately from Sanskrit.

    From Wiktionary

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