**Definition:** ratio of the hypotenuse to the adjacent side of a right-angled triangle

**Similar words:** circular function, trigonometric function

**Definition:** function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle

**Synonyms:** secant

**Definition:** a straight line that intersects a curve at two or more points

**Similar words:** straight line

**Definition:** a line traced by a point traveling in a constant direction; a line of zero curvature

**Usage:** *the shortest distance between two points is a straight line*