in·ter·change 
(ĭn′tər-chānj)
(ĭn′tər-chānj)v. in·ter·changed, in·ter·chang·ing, in·ter·chang·es
v.tr.
1. To switch each of (two things) into the place of the other.
2. To give and receive mutually; exchange.
3. To cause to succeed each other in a series or pattern; alternate: interchanged gold and silver beads in the bracelet.
v.intr.
1. To change places with each other.
2. To succeed each other; alternate.
n. (ĭntər-chānj′)
1. The act or process of interchanging.
2. A highway intersection that employs ramps and overpasses or underpasses to permit traffic to move freely from one road to another without crossing another line of traffic.
[Middle English enterchaungen, from Old French entrechangier, to change : entre-, between (from Latin inter-; see INTER-) + changier, to change; see CHANGE.]
in′ter·changer n.