A connection between two or more lines, services or modes of transport; a station at which such a connection can be made.
An act of interchanging.
A highway junction in which traffic may change from one road to another without crossing a stream of traffic.
to swap or change places
to alternate; to intermingle or vary
to mutually give and receive (something); to exchange
To act as or carry out an interchange (noun, senses 2, 3).
to switch (each of two things)
any equipment that establishes connections between telephones
the rooms housing such equipment