n. The act of intersecting; a cutting or dividing, or cutting across: as, the intersection of a map by lines of latitude and longitude.n. A place of crossing; specifically, a point common to two lines or a line and a surface, or a line common to two surfaces: as, a house at the intersection of two roads; the intersection of two geometrical lines or figures.n. In logic, the relation of two classes each of which partly excludes and partly includes the other.