the act of changing one thing for another thing | a mutual or reciprocal action; interacting |
mutual interaction; the activity of reciprocating or exchanging (especially information) | (physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons |
reciprocal transfer of equivalent sums of money (especially the currencies of different countries) | |
a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams | |