interchange

英[ɪntə'tʃeɪn(d)ʒ] 美['ɪntɚtʃendʒ]

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

2. mutual interaction; the activity of interchanging or reciprocating

3. reciprocal transfer of equivalent sums of money especially the currencies of different countries;

"he earns his living from the interchange of currency"