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Definition of First-party
1. Adjective. Of or relating to someone directly involved in a given transaction, such as a buyer or seller. ¹
2. Adjective. Of or relating to the plaintiff in a lawsuit. ¹
3. Adjective. (video games) Of a video game, developed and published by company responsible for the platform on which it is released (or its internal developers), as opposed to third-party. ¹
4. Adjective. (video games) Originating from such a video game. ¹
¹ Source: wiktionary.com