arccosine arccosecant • arccotangent · · · Info · Definitions · Synonyms · Characters · · arccosine · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) the inverse function of the cosine; the angle that has a cosine equal to a given number. Synonyms: arc cosine, arccos, inverse cosine. · · Noun Definition 1 Synonyms · · · arc cosine · · Synonym 1 arccos · · Synonym 2 inverse cosine · · Synonym 3 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073