interchange

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

reciprocal transfer of equivalent sums of money (especially the currencies of different countries)

he earns his living from the interchange of currency

the act of changing one thing for another thing

Adam was promised immortality in exchange for his disobedience

there was an interchange of prisoners

a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams

reverse (a direction, attitude, or course of action)

cause to change places

interchange this screw for one of a smaller size

give to, and receive from, one another

Would you change places with me?

We have been exchanging letters for a year

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