cotangent cot • cotangential · · · Info · Definitions · Synonyms · Characters · · cotangent · · Text Latin · · Script 9 · · Length Definitions · · · (noun) ratio of the adjacent to the opposite side of a right-angled triangle. Synonyms: cotan. · · Noun Definition 1 Synonyms · · · cotan · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 g latin small letter g U+0067 n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074