exchange
/ɛksˈtʃeɪndʒ/
An act of exchanging or trading.
All in all, it was an even exchange.
A place for conducting trading.
The stock exchange is open for trading.
A telephone exchange.
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.
A conversation.
After an exchange with the manager, we were no wiser.
The loss of one piece and associated capture of another
The thing given or received in return; especially, a publication exchanged for another.
The transfer of substances or elements like gas, amino-acids, ions etc. sometimes through a surface like a membrane.
The difference between the values of money in different places.