early 15c., "an exchange, act of exchanging reciprocally," from Old French entrechange, from entrechangier (see interchange (v.)). Meaning "alternate succession" is from 1550s. In reference to a type of road junction, 1944.
late 14c., enterchaungen, "to give and receive reciprocally; to alternate, put each in place of the other" (trans.), also "change reciprocally" (intrans.), from Old French entrechangier "interchange, exchange," from entre- "between" (see inter-) + changier "to change" (see change (v.)). Related: Interchanged; interchanging.
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