transactions (sales and purchases) having the objective of supplying commodities (goods and services) | the act of changing one thing for another thing |
social exchange, especially of opinions, attitudes, etc. | mutual interaction; the activity of reciprocating or exchanging (especially information) |
| 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 |