instancing
 n.— «Many quests allow the player to enter into an “instance” which is a sort of parallel universe in which the player and whatever group they are part of leave the main gameworld and enter a “court” of their own. Instancing, as it is known, is a controversial practice among the hard-core MMOG crowd because it breaks the illusion of the game as one seamless “virtual world.” On the other hand, it allows players greater control of their individual experience and reduces server overhead and lag.» —“Is It Possible to Surpass World of Warcraft?” by David Cole Next Generation Aug. 29, 2006. (source: Double-Tongued Dictionary)

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