exchange

An act of exchanging or trading.

A place for conducting trading.

A telephone exchange.

(telephony, US) The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes).

A conversation.

(chess) The loss of one piece and associated capture of another.

(usually with "the") The loss of a minor piece (typically a bishop or knight) and associated capture of the more advantageous rook.

(obsolete) The thing given or received in return; especially, a publication exchanged for another.

(biochemistry) The transfer of substances or elements like gas, amino-acids, ions etc. sometimes through a surface like a membrane.

(finance) The difference between the values of money in different places.

(law, England & Wales, Northern Ireland) Clipping of exchange of contracts.