Definitions from Wiktionary ( )

▸ noun:  An act of exchanging or trading.
▸ noun:  A place for conducting trading.
▸ noun:  A telephone exchange.
▸ noun:  (telephony, US) The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes).
▸ noun:  A conversation.
▸ noun:  (chess) The loss of one piece and associated capture of another.
▸ noun:  (usually with "the") The loss of a minor piece (typically a bishop or knight) and associated capture of the more advantageous rook.
▸ noun:  (obsolete) The thing given or received in return; especially, a publication exchanged for another.
▸ noun:  (biochemistry) The transfer of substances or elements like gas, amino-acids, ions etc. sometimes through a surface like a membrane.
▸ noun:  (finance) The difference between the values of money in different places.
▸ verb:  (transitive) To trade or barter.
▸ verb:  (transitive, figurative) To mutually direct at each other.
▸ verb:  (transitive) To replace with, as a substitute.
▸ verb:  (transitive) To recommend and get recommendations.
▸ noun:  (law, England and Wales, Northern Ireland) Clipping of exchange of contracts. [(law, England and Wales, Northern Ireland) The act of exchanging contracts.]
▸ verb:  (law, England and Wales, Northern Ireland) Clipping of exchange contracts. [(law, England and Wales, Northern Ireland, idiomatic) To formally contract to purchase, sell or otherwise be party to a disposition of an estate in land; usually requiring the payment of a deposit by one of the parties.]

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