exchanges

noun

1. An act of exchanging or trading.“All in all, it was an even exchange.”
2. A place for conducting trading.“The stock exchange is open for trading.”
3. A telephone exchange.
4. The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes).“NPA-NXX-1234 is standard format, where NPA is the area code and NXX is the exchange.”