Definition:Intersection (Geometry)

Definition
The intersection of two lines $AB$ and $CD$ is denoted by $AB \cap CD$.

The intersection of two geometric figures is the set of points shared by both figures.

Note that this use of $\cap$ is consistent with that of its more usual context of set intersection.

When two lines intersect, they are said to cut each other.

Also see

 * Definition:Section of Line by Line