1. The act of joining, or the state of being joined; union; combination; coalition; as, the junction of two armies or detachments; the junction of paths.
2. The place or point of union, meeting, or junction; specifically, the place where two or more lines of railway meet or cross.
Junction plate Boilers, a covering or break-join plate riveted to and uniting the edges of sheets which make a butt joint.
Junction rails Railroads, the switch, or movable, rails, connecting one line of track with another.