Noun: third party thurd paa(r)-tee
- Someone other than the principals who are involved in a transaction
"The dispute was resolved with the help of a third party mediator"
- A political party organized in opposition to the major parties in a two-party system
"The third party candidate hoped to disrupt the traditional political landscape"
Derived forms: third parties
Type of: arbiter, arbitrator, party, political party, umpire
Encyclopedia: Third party