Definition:Endpoint


 * Geometry:
 * The endpoint of a line segment.


 * Analysis:
 * The endpoint of a real interval.

The concepts are related in the real number line, which is a one-to-one correspondence between a line and the set of real numbers.

A related use of the term in a different context:


 * Graph Theory:
 * The endvertices or endpoints of an edge $e$ are the vertices $u$ and $v$.