Meaning of COTANGENT in English

COTANGENT

[ kəʊ'tandʒ(ə)nt ]

■ noun Mathematics (in a right-angled triangle) the ratio of the side (other than the hypotenuse) adjacent to a particular acute angle to the side opposite the angle.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.