third party

noun

1. any party to an incident, case, quarrel, etc., who is incidentally involved.
2. (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.

third party

noun

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

adjective

1. insurance providing protection against liability caused by accidental injury or death of other persons or damage to their property

   third-party insurance

Word History and Origins

Origin of third party¹

An Americanism dating back to 1795–1805

Related Words

• mediator