Definition 2022


third party

See also: third-party



third party (countable and uncountable, plural third parties)

  1. someone not directly involved in a transaction. A third entity in the Seller (first party) and Customer (second party) relationship. A Seller may employ a third party to perform specific services to augment the value of a product. For example, a manufacturer may employ a third party to pack and distribute a product. A computer manufacturer may augment their product with software from a third-party supplier.
  2. someone only incidentally or tangentially connected to an incident or dispute; someone other than the principals; a bystander or independent witness.
  3. a political party in opposition to the main parties in a two-party system
    • 2004, James Walsh, Liberty in Troubled Times, p 195
      [] the Libertarian Party (in its own shorthand, the LP) is usually the largest third party []


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See also