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arc cosine

American  

noun

Trigonometry.

  1. the angle, measured in radians, that has a cosine equal to a given number. arc cos; cos −1

arc cosine Scientific  

  1. The inverse of the cosine function.

Etymology

Origin of arc cosine

First recorded in 1905–10

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.