noun
the inverse function of the cosine; the angle that has a cosine equal to a given number
• Syn: ↑arc cosine, ↑arccosine, ↑arccos
• Hypernyms: ↑trigonometric function, ↑circular function
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noun* * *
Trig.
See arc cosine.
[1905-10]
Useful english dictionary. 2012.