MMO
Full definition of MMO
Noun
MMO
(plural MMOs)- (video game genre, initialism) A massively multiplayer online game. A computer game in which a large number of players can simultaneously interact in a persistent world.
- (colloquial, initialism) A massively multiplayer online role-playing game.
Usage notes
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.