1. Mutual interaction; the activity of reciprocating or exchanging (especially information)
   "The interchange of ideas at the conference was stimulating";
   - reciprocation, give-and-take
    
2. The act of changing one thing for another thing
   "there was an interchange of prisoners";
   - exchange
    
3. Reciprocal transfer of equivalent sums of money (especially the currencies of different countries)
   "he earns his living from the interchange of currency";
   - exchange
    
4. A junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
   "The new highway interchange reduced congestion significantly"

1. Put in the place of another; switch seemingly equivalent items
   "synonyms can be interchanged without changing the context's meaning";
   - substitute, replace, exchange, sub [informal]
    
2. Give to, and receive from, one another
   "We have been interchanging letters for a year";
   - exchange, change
    
3. Cause to change places
   "interchange this screw for one of a smaller size";
   - counterchange, transpose

Derived forms: interchanges, interchanged, interchanging

Type of: alter, change, commerce, commercialism, group action, interaction, junction, mercantilism, modify, transfer

Part of: highway, main road

Encyclopedia: Interchange