WordReference Random House Learner's Dictionary of American English © 2014
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.

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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