Wiktionary
n. (context geometry English) A part of a straight line bounded by two points.
Wikipedia
In geometry, a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints. A closed line segment includes both endpoints, while an open line segment excludes both endpoints; a half-open line segment includes exactly one of the endpoints.
Examples of line segments include the sides of a triangle or square. More generally, when both of the segment's end points are vertices of a polygon or polyhedron, the line segment is either an edge (of that polygon or polyhedron) if they are adjacent vertices, or otherwise a diagonal. When the end points both lie on a curve such as a circle, a line segment is called a chord (of that curve).
Usage examples of "line segment".
Mathematical ideas exist between adjacent points on a line segment.
Take a line segment of a certain length and move it an equal length at right angles to itself.
It was as if a mathematician had tried to explain to someone who didn't even know arithmetic how he could determine the equation of a complicated curve from a short line segment.
Fabian pointed to a hole midway down the last line segment, “.
Nobody had complete, secure control of an entire Labyrinth main line segment any more, and neither side had sufficient forces to knock the other out.