An act of interchanging.

A highway junction in which traffic may change from one road to another without crossing a stream of traffic.

(rail transport) A connection between two or more lines, services or modes of transport; a station at which such a connection can be made.

(transitive) to switch (each of two things)

(transitive) to mutually give and receive (something); to exchange

(intransitive) to swap or change places

(transitive) to alternate; to intermingle or vary

(transport) To act as or carry out an interchange (noun, senses 2, 3).