English Reference
noun

transaction

n.
US /tɹænˈzækʃən/ UK /tɹænsˈækʃən/ trans·ac·tion UK spelling transaction's, transaction's

  1. 01 B2 Upper Intermediate

    the act of buying or selling something, or an exchange of money for goods.

    an instance of buying or selling; a business deal or the exchange of funds, goods, or services.

    Simple

    The entire transaction took only a few seconds using the mobile app.

    In context

    The bank monitors every financial transaction for suspicious activity to prevent international money laundering and fraud.

  2. 02 C1 Advanced Technical Computing

    a set of computer operations that must all happen together or not at all.

    an atomic sequence of operations in a database or system that is treated as a single unit of work.

    Simple

    If the power goes out during the transaction, the database will undo the partial changes.

    In context

    To ensure data integrity, the system wraps the inventory update and the payment processing into a single database transaction.

    Usage

    Often used in the context of database management and ACID properties.

    operationunit of work
  3. 03 C1 Advanced Academic

    an instance of people communicating or behaving toward each other.

    a communicative action or social interaction between two or more people.

    Simple

    The psychologist studied the transaction between the mother and her child.

    In context

    The study focuses on the linguistic transactions that occur in high-stakes corporate negotiations.

  4. 04 C2 Proficiency Formal

    the official written records of a meeting or a professional group.

    the published records of the proceedings of a learned society or professional organisation.

    Simple

    You can find the research paper in the latest Transactions of the Royal Society.

    In context

    The library maintains an extensive archive of the society's annual transactions dating back to the nineteenth century.

    Usage

    Almost always used in the plural form 'transactions'.

Usage transaction cost

Criminals like cash because unlike card transactions or bank transfers, it is largely untraceable, which makes it useful for both transactions and money laundering.

BBC News· 7 Jun 2026

That made admission less a transaction than a delicate equation of geography, endurance and luck.

The Guardian· 7 Aug 2026

Borrowed from Middle French transaction, from Old French transaccion, from Late Latin transactio.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin la-lat transactio
Level C1 · Advanced
Frequency Common
Updated