arc sine

noun Trigonometry.

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

Nearby words

  1. arc light,
  2. arc of lowitz,
  3. arc sec,
  4. arc secant,
  5. arc second,
  6. arc spectrum,
  7. arc tan,
  8. arc tangent,
  9. arc welding,
  10. arc, d'

Origin of arc sine

First recorded in 1905–10

Also called inverse sine. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for arcsin


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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for arcsin

arc sine

The inverse of the sine function.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.