# arc sine

- the angle, measured in radians, that has a sine equal to a given number. Abbreviation: arc sin, arcsin; Symbol: sin−1

## Origin of arc sine^{}

First recorded in 1905–10

Also called inverse sine.

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# arcsin

- arcsine: the function the value of which for a given argument between –1 and 1 is the angle in radians (between –π/2 and π/2), the sine of which is that argument: the inverse of the sine function

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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# arc sine

- The inverse of the sine function.

The American Heritage® Science Dictionary
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