More definitions

Here's another set of definitions from the glossary of Ron Edwards's "Gamism: Step on Up":

"System (character creation, resolution including IIEE, reward system, metagame mechanics): the means by which imaginary events are established during play (see the Lumpley Principle)."

"The Lumpley Principle: 'System (including but not limited to "the rules") is defined as the means by which the group agrees to imagined events during play.' The author of the principle is Vincent Baker."

"IIEE: Intent, Initiation, Execution, and Effect--how actions and events in the imaginary game-world are resolved in terms of real-world announcement and imaginary order of occurrence."

"Reward System: enjoyability payoff that prompts further play, usually expressed in Explorative terms but not restricted to Exploration."

"Exploration: social and personal imagination, creation of fictional events through communicating among one another."