arc cosine

noun

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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Also called inverse cosine.

Origin of arc cosine

First recorded in 1905–10

Words nearby arc cosine

arbuthnot, arbutus, arc, arc cos, arc cosecant, arc cosine, arc cot, arc cotangent, arc csc, arc de triomphe, arc furnace
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for arc cosine

arc cosine

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