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definition of the word exchange

by the Wiktionnary

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exchange (plural exchanges)

  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. (telephony, US only?) The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes).
    The 555 exchange is reserved for use by the phone company, which is why it's often used in films.
    NPA-NXX-1234 is standard format, where NPA is the area code and NXX is the exchange.
  4. A conversation.
    After an exchange with the manager, we were no wiser.

Definition from Wiktionary
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