An act of interchanging.
A connection between two or more lines, services or modes of transport; a station at which such a connection can be made.
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)
A transposition.
a musical instrument that is written in a different pitch to how it sounds, often for ease of playing multiple instruments of the same family that have different ranges.