n. mutual interaction; the activity of reciprocating or exchanging (especially information)

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

n. [the act or process of changing places]

n. the act of changing one thing for another thing; "Adam was promised immortality in exchange for his disobedience"; "there was an interchange of prisoners"

v. cause to change places; "interchange this screw for one of a smaller size"

v. give to, and receive from, one another; "Would you change places with me?"; "We have been exchanging letters for a year"

v. put in the place of another; switch seemingly equivalent items; "the con artist replaced the original with a fake Rembrandt"; "substitute regular milk with fat-free milk"; "synonyms can be interchanged without a changing the context's meaning"