Intersecting lines definition: The point at which two lines (or curves) touch, even if the lines/curves do not cross each other, is called their intersection. The lines (or curves) are said to intersect at that point. So, the corner of a rectangle is a point of intersection of two of the sides. Intersecting lines are lines that share a point in common (or, less commonly described as "intersecting," coincide entirely).
What's in a word? inter- (between or among, mutually or together) + -sect (cut) = "mutually cutting"; two roads "cut" (across) each other at their intersection.
