Instance

[Sarah]

Instances are dungeons and special areas in World of Warcraft which many copies can exist at once. An instance allows many groups of players to traverse the same geography and battle the same enemies at the same time, without interfering with each other. Instances are accessible by a swirling portal. They may be blocked by a locked door which requires a key.
Instances were made as a way so solve a set of related problems which had become obvious. Everyone wants to slay the hardest monsters and get the best [loot], but having the whole server at the very same spot at the same time would've crashed the server.
In World of Warcraft you can find instances such as [Naxx] and [BWL].

[Sommer]

Discussing an [unusual] topic or subject only to [have it] [come up] again in an unrelated occasion.

[Britney]

An instance is a place where people go to waste theyre lives in an endless [circlejerk] surrounded by retards. If you really enjoy them you probably hate yourself. If you have not started already then dont. It is an endless [pit] of pain and regret. Your family will [hate you], you will never get a girlfriend and you will probably loose your job.

[Couch Potatoe]

An example or single occurrence of something.