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arc cosine

noun
1.
Trigonometry. the angle, measured in radians, that has a cosine equal to a given number. Symbol: cos −1.
Abbreviation: arc cos;
Also called inverse cosine.
Origin
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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arc cosine in Science
arc cosine  
The inverse of the cosine function.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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