first-party ‎(not comparable)

  1. Of or relating to someone directly involved in a given transaction, such as a buyer or seller.
  2. Of or relating to the plaintiff in a lawsuit.
  3. (video games) Of a video game, a character, etc., created or published by the company responsible for the platform on which it is released (or its internal developers), as opposed to third-party.
    a first-party video game; a first-party character; first-party hardware