Defined Game Terms:
If a definition is specific to one game it will be indicated in brackets after the term.
• ability check: A check of 1d20 + the appropriate ability modifier vs. a DC.
• ability modifier: The bonus or penalty associated with a particular ability score.
• alignment: One of the nine descriptors of morality and ethics: lawful good (LG), neutral good (NG), chaotic good (CG), lawful neutral (LN), neutral (N), chaotic neutral (CN), lawful evil (LE), neutral evil (NE), and chaotic evil (CE).
• Armor Class (AC) [D&D]: A number representing a creature’s ability to avoid being hit in combat. An opponent’s attack roll must equal or exceed the target creature’s Armor Class to hit it.
• attack of opportunity: A single extra melee attack per round that a combatant can make when an opponent within reach takes an action that provokes attacks of opportunity.
• blinded [D&D v.3.0]: Unable to see. A blinded character suffers a 50% miss chance in combat, loses any Dexterity bonus to AC, moves at half speed, and suffers a 4 penalty on Search checks and on most Strength- and Dexterity-based skill checks. Any skill check that relies on vision automatically fails. Opponents of a blinded character gain a +2 bonus to their attack rolls, since they are effectively invisible.
Etc.