Third-party meaning

thʉrdpärtē
Someone not directly involved in a transaction. A third entity in the Seller (first party) and Customer (second party) relationship. A Seller may employ a third party to perform specific services to augment the value of a product. For example, a manufacturer may employ a third party to pack and distribute a product. A computer manufacturer may augment their product with software from a third-party supplier.
noun
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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.

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.

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A political party organized as opposition to the existing parties in a two-party system.
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A political party organized to compete against the two major parties in a two-party system.
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A person or, often, specif., a legal entity, in a case or matter other than the principals.
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Of or involving a third party.

A third-party candidate, third-party debt collection.

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Designating or of a product developed or manufactured by one vendor, and compatible with or sold along with the product of another vendor.

A third-party software application.

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A separate individual or organization other than the two principals involved. A third party is typically a company that provides an auxiliary product not supplied by the primary manufacturer to the end user (the two principals). Countless third-party add-on and plug-in products keep the computer industry advancing at a rapid pace. The third-party vendor is often the most innovative.
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Someone who is not a party to a lawsuit, agreement, or other interaction, but is in some way involved or affected by it; someone other than the principles to an agreement or a lawsuit.
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Someone only incidentally or tangentially connected to an incident or dispute; someone other than the principals; a bystander or independent witness.
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A political party in opposition to the main parties in a two-party system.
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Of or relating to a third party.
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(video games) Of a video game, developed and published by an independent video game publisher or its internal development teams, as opposed to first-party.

Third-party video game.

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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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(video games) Originating from such a video game.

Third-party character.

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