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third party

The definition of a third party is the other major, competitive party in a largely two-party system in politics, or a person who is not a primary person in a situation.

(noun)

An example of a third party is the Green Party, running alongside the Republicans and Democrats.
An example of a third party is the neighbor who overheard a couple fighting in their home.

See third party in Webster's New World College Dictionary

☆ a political party organized to compete against the two major parties in a two-party system
a person in a case or matter other than the principals

See third party in American Heritage Dictionary 4

noun

A political party organized as opposition to the existing parties in a two-party system.
One other than the principals involved in a transaction: I pay rent to a third party, not directly to the landlord.

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