abbrev. for arc-cosine: the function the value of which for a given argument between --1 and 1 is the angle in radians (between 0 and π), the cosine of which is that argument: the inverse of the cosine function
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"