The meaning of the Acronym MMO is...

MMO is

• Mass Multiplayer Online

More Meanings For MMO:

• Multi-Model Optimization
• Materials Management Office
• Monthly Market Outlook
• Monthly Market Outlook
• Mercy Medical Operations
• Missouri Missions Offering
• Memo writer file (RapidFile)
• Mass Multiplayer Online
• Materials Management Office
• Materials Management Office
• Materials Management Office
• Marvel Mystery Oil
• MegaMan Original Series
• Money Makin Operations
• Memory Map Overlay

MMO is also in:

• Electronics
• File Extensions
• Funnies
• General
• Media
• Military
• NASA
• Non-Profit Organizations
• Religion
• Stock Exchange
• Unfiled
• US Government