1. The act of conducting or carrying out (business, negotiations, plans).
  2. A deal or business agreement.
  3. An exchange or trade, as of ideas, money, goods, etc.
  4. The transfer of funds into, out of, or from an account.
  5. An atomic operation; a message, data modification, or other procedure that is guaranteed to perform completely or not at all (e.g. a database transaction).
  6. A record of the proceedings of a learned society

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