sec (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
1593, from L. secantem (nom. secans) "cutting," prp. of secare "to cut" (see section). First used by Dan. mathematician Thomas Fincke in Geometria Rotundi (1583).
A straight line or ray that intersects a curve, especially a circle, at two or more points.
The ratio of the length of the hypotenuse in a right triangle to the side adjacent to an acute angle. The secant is the inverse of the cosine.
The reciprocal of the abscissa of the endpoint of an arc of a unit circle centered at the origin of a Cartesian coordinate system, the arc being of length x and measured counterclockwise from the point (1, 0) if x is positive or clockwise if x is negative.
A function of a number x, equal to the secant of an angle whose measure in radians is equal to x.