Definition from Wiktionary, the free dictionary
MMO (plural MMOs)
- (video games, initialism) A massively multiplayer online game. A computer game in which a large number of players can simultaneously interact in a persistent world or can potentially play against a large number of players in matchmaking.
- (colloquial, initialism) A massively multiplayer online role-playing game.
- Often used as a prefix, for example MMORPG for massively multiplayer online role-playing game or MMOFPS for massively multiplayer online first-person shooter. It is occasionally used for massive multiplayer online role-playing game, as it is the most common genre of online games.