WordReference Random House Learner's Dictionary of American English © 2015
ˈthird ˈpar•ty, n. [countable]
  • any party to a case or quarrel only partly involved and not one of the primary disputants.
  • Government(in a two-party system) a usually temporary political party, often founded to promote a particular policy.
  • Computinga supplier of additional goods or support for a product or service who is neither the primary seller or supplier nor the purchaser.

  • WordReference Random House Unabridged Dictionary of American English © 2015
    third party, 
  • any party to an incident, case, quarrel, etc., who is incidentally involved.
  • Government(in a two-party system) a political party formed as a dissenting or independent group from members of one or both of the two prevailing major parties.
  • Etymology:1795–1805, American.

    Collins Concise English Dictionary © HarperCollins Publishers::

    third party n
    1. a person who is involved by chance or only incidentally in a legal proceeding, agreement, or other transaction, esp one against whom a defendant claims indemnity
    1. providing protection against liability caused by accidental injury or death of other persons or damage to their property

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