1. (n.) A line that cuts another; especially, a straight line intersecting a curve at two points\.

2. (a.) Cutting; dividing into two parts; as, a secant line.

3. (n.) A right line drawn from the center of a circle through one end of a circular arc, and terminated by a tangent drawn from the other end; the number expressing the ratio line of this line to the radius of the circle. See Function.

air line axis beeline chiasmal chiasmic chiastic chord crisscross cross crosscut crossed crossing cut across decussate decussated diagonal diameter direct line directrix edge great-circle course intersected intersecting normal perpendicular radius radius vector right line segment shortcut side straight straight course straight line straight stretch straightaway streamline tangent transversal vector