arctan Arctamerican • arctangent · · · Info · Definitions · Synonyms · Characters · · arctan · · Text Latin · · Script 6 · · Length 2 · · Syllables Definitions · · · (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number. Synonyms: arc tangent, arctangent, inverse tangent. · · Noun Definition 1 Synonyms · · · arc tangent · · Synonym 1 arctangent · · Synonym 2 inverse tangent · · Synonym 3 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074