[n] mutual interaction; the activity of interchanging or reciprocating
[n] reciprocal transfer of equivalent sums of money especially the currencies of different countries; "he earns his living from the interchange of currency"
[n] a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
[v] reverse, as of direction, attitude, or course of action
[v] cause to change places, as of parts, for example
[v] give to, and receive from, one another; "Would you change places with me?"; "We have been exchanging letters for a year"
alternate, change, counterchange, exchange, exchange, flip, flip-flop, give-and-take, reciprocation, switch, tack, transpose