arc cosine

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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

How the polling firms and the media adjust to new realities also seems to be a rather long arc.
The Gun Battle Since Newtown|Cliff Schecter|December 14, 2014|DAILY BEAST
So the plan is for Ken to draw an arc with Dale doing covers, and then Dale does an arc with Ken doing covers.
Gail Simone’s Bisexual Catman and the ‘Secret Six’|Rich Goldstein|December 6, 2014|DAILY BEAST
A Molotov cocktail tumbled in an arc overhead and erupted briefly in a blaze.
Mexican Protesters Look to Start a New Revolution|Jason McGahan|November 21, 2014|DAILY BEAST
The stream of bubbly from the popped champagne bottle creates an angelic arc over her, and lands right in the glass.
Kim Kardashian Bares Her Shiny, Bounteous Butt, Breaks the Internet|Marlow Stern|November 12, 2014|DAILY BEAST

At this point in the arc, he doubts what Hershel is telling him.
The Walking Dead’s Luke Skywalker: Rick Grimes Is the Perfect Modern-Day Mythical Hero|Regina Lizik|October 28, 2014|DAILY BEAST
In this position, the line of cavalry formed the chord of the arc described by the river, and occupied by us.
Blackwood's Edinburgh Magazine, No. CCCXXXIX. January, 1844. Vol. LV.|Various
The sequestered spot, a seat beneath a plane tree, with a lonesome arc-lamp shining full upon it, was occupied.
The Joyous Adventures of Aristide Pujol|William J. Locke
She looked very haggard and helpless beneath the blue arc-lights.
The Joyous Adventures of Aristide Pujol|William J. Locke
He threw the ship like a giant shell in a screaming, sweeping arc upon the red craft that drove across their bow.
Astounding Stories, May, 1931|Various
When the sun swung into its western arc I halted where a large number of warriors had broken their fast.
A Virginia Scout|Hugh Pendexter

arc cosine

The inverse of the cosine function.