Game world

game world, gameworld, n. used to describe the characteristics of a play-setting for a role-playing game, which can include any of the following: physical location and climate; indigenous vegitation, animal, and sentient life; technological advancement and available equipment; social, economic, and governmental structures, including laws and mores; presence of psionics, super-powers, magic, or other paranormal powers (such as lycanthropy and vampirism); see milieu. [MW]
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Addendum: The "world" in "gameworld" is a little inaccurate as a gameworld might be as small as a single city where the player characters live or as large as an entire universe having numberless populated planets. [MW]