Jackelope King said:A world isn't neccessary. At best, a setting of some kind is. I know you claim that "world" in this case could mean something as simple as a totally isolated dungeon, but why beat around the bush when what you want is a simple definition anyway? Just say "setting", or even better, "environment".
And you do have to clarify "system". As it is, that part of the definition you put forth is completely useless. To parrot you for a moment, "What does the system do?" Unless you describe this, your definition is lacking.
A roleplaying game is an activity in which the player assumes the role of a character in a fictional environment with a system that describes how to facilitate and resolve conflicts within that environment.
an activity- categorical part of the definition
fictional environment- better wording than "imaginary world"
to facilitate and resolve conflicts within that environment- removes "imaginary world", clarifies what the system does (facilitates and resolves conflicts)
For my purposes 'setting' or 'environment' is too limiting. I prefer 'world' because it doesn't constrain matters as much as your alternatives do. A setting or environment can be part of a world, but I don't see how they could substitute for a world.
So why keep emphasizing 'world'? Because a world is where you live. You can have adventures in a setting or environment, but you live in a world. You can have adventures as part of your life, but adventure as the whole of your life gets tedious after awhile.
And why system as describing how the world works? Because a world is more than action and conflict. A character lives somewhere. He can get involved in action and conflict, but that is not the whole of what he can do. He could engage in trade or research. He could enter politics or diplomacy. He could travel to strange and exotic lands. He is not limited to action and conflict.
Part of describing how the world works includes how action and conflict are handled, so when I say that an RPG includes "...a sytem describing how the world works." it incorporates action and conflict.
Now why do I call it a pastime? Because it is. It is an activity, but it is also a pastime. Something you do to pass the time. An RPG as I've defined it is an entertainment. You participate because you enjoy it, because you think it's a good way to pass the time. Not all activities are pastimes, but all pastimes are activities.
BTW, you almost say the same thing I do, but you use more words to say it. Get yourself a good print dictionary and read a few definitions. Note how terse the definitions are. I am trying to be as succint as I can. If I could come up with wording that is even more succinct, and still say says what needs to be said, I would use it. People for the most part are not interested in a long explanation, they want the essentials in a nutshell; when such an explanation is possible. I contend that where RPGs are concerned such is indeed possible.
(I'll be composing a post offline going into detail. That post will start a new thread. This thread is now declared open. Just be sure to keep it to matters relevant (even if tenuously) to RPGs.

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