a mental model created by people as a representation of a reality (actual or fictional) for contemplation and communication (e.g., a story, telephone conversation, or movie);
a computer-generated, persistent, immersive representational one-dimensional, two-dimensional, three-dimensional or even n-dimensional depiction of a persistent virtual environment placed in abstract data structures, which can be experienced by numerous participants at once, who are represented within the space by avatars. Currently, the most popular virtual worlds are Massively multiplayer online games and Massively multiplayer online role playing games, such as Everquest, Star Wars Galaxies, Ultima Online or Lineage.
the Shared region where human and computer meet; where their respective worlds coincide.
