World English Dictionary
arcsin (ˈɑːkˌsaɪn)
abbreviation for
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 10th Edition
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the inverse function of the sine; the angle that has a sine equal to a given number [syn: arc sine
WordNet® 3.0, © 2006 by Princeton University.
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