柯林斯詞典secant /?si?k?nt/ 1. N (of an angle) a trigonometric function that in a right-angled triangle is the ratio of the length of the hypotenuse to that of the adjacent side; the reciprocal of cosine (角的)正割 ( abbr: sec) 返回 secant劍橋詞典in a triangle that has one angle of 90°, the ratio of the hypotenuse (= the length of the side opposite the 90° angle ) to the length of the side next to an angle less than 90° 正割 a line that crosses a circle at two places 割線 返回 secant