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 Line:  One of the basic undefined terms of geometry. A line has no thickness but its length goes on forever in two directions.

Basic Terms at mathleague.com: Read more about lines, points, segments, and rays.

Basic Terms at Thinkquest.org: Read more about the basic meanings of the Geometry words: equidistant, points, line, plane, collinear, coplanar, intersection, and angles.

Points, Lines and Planes: Read more about points, lines and planes.