Trigonometry. the angle, measured in radians, that has a cosine equal to a given number. Abbreviation: arc cos; Symbol: cos−1
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- arbutus, trailing,
- arc cos,
- arc cosecant,
- arc cot,
- arc cotangent,
- arc csc,
- arc de triomphe,
- arc de triomphe de l'étoile
Origin of arc cosine
First recorded in 1905–10
Also called inverse cosine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
The inverse of the cosine function.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.