interchange (v.) Look up interchange at Dictionary.com
late 14c., from Old French entrechangier, from entre- (see inter-) + changier "to change" (see change (v.)). Related: Interchanged; interchanging.
interchange (n.) Look up interchange at Dictionary.com
1540s, "act of exchange, from Old French entrechange, from entrechangier (see interchange (v.)). In reference to a type of road junction, 1944.