What does EXCHANGE mean?

noun

1. chemical process in which one atom or ion or group changes places with another
2. a mutual expression of views (especially an unpleasant one)“they had a bitter exchange”
3. the act of changing one thing for another thing“Adam was promised immortality in exchange for his disobedience”
4. the act of giving something in return for something received“deductible losses on sales or exchanges of property are allowable”
5. a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
6. a workplace for buying and selling; open only to members
7. (sports) an unbroken sequence of several successive strokes“after a short rally Connors won the point”
8. reciprocal transfer of equivalent sums of money (especially the currencies of different countries)“he earns his living from the interchange of currency”