interchange

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To switch each of (two things) into the place of the other.
• intransitive verb To give and receive mutually; exchange.
• intransitive verb To cause to succeed each other in a series or pattern; alternate.
• intransitive verb To change places with each other.
• intransitive verb To succeed each other; alternate.
• noun The act or process of interchanging.
• noun A highway intersection designed to permit traffic to move freely from one road to another without crossing another line of traffic.

from The Century Dictionary.

• To exchange mutually or reciprocally; put each of in the place of the other; give and take in reciprocity: as, to interchange commodities; to interchange compliments or duties.
• To cause to follow one another alternately: as, to interchange cares with pleasures.
• To change reciprocally; succeed alternately.
• noun The act of exchanging reciprocally; the act or process of giving and receiving with reciprocity: as, an interchange of civilities or kind offices.
• noun Alternate succession: as, the interchange of light and darkness.
• noun Synonyms See exchange.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To make an interchange; to alternate.
• transitive verb To put each in the place of the other; to give and take mutually; to exchange; to reciprocate
• transitive verb To cause to follow alternately; to intermingle; to vary.
• noun The act of mutually changing; the act of mutually giving and receiving; exchange.
• noun The mutual exchange of commodities between two persons or countries; barter; commerce.
• noun Alternate succession; alternation; a mingling.
• noun An intersection between highways, having two or more levels and a series of connecting roadways so that traffic on one highway may pass over or under the other highway without crossing through the line of traffic, and vehicles may pass from one highway to the other while traffic on both highways continues uninterrupted. A common interchange is the cloverleaf.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive to switch (each of two things)
• verb transitive to mutually give and receive (something); to exchange
• verb intransitive to swap or change places
• verb intransitive to alternate
• noun An act of interchanging.
• noun A highway junction in which traffic may change from one road to another without crossing a stream of traffic.
• noun rail transport A connection between two or more lines, services or modes of transport; a station at which such a connection can be made.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
• verb cause to change places
• noun the act of changing one thing for another thing
• verb put in the place of another; switch seemingly equivalent items
• verb reverse (a direction, attitude, or course of action)
• noun reciprocal transfer of equivalent sums of money (especially the currencies of different countries)
• noun mutual interaction; the activity of reciprocating or exchanging (especially information)
• verb give to, and receive from, one another