Look up MMO in Wiktionary, the free dictionary.
MMO may refer to:
Entertainment
- Massively multiplayer online game, a video game that can be played by many people simultaneously
 - Music Minus One, a record company in Westchester, New York
 
Science and technology
- Methane monooxygenase, an enzyme
 - Maximum operating Mach number
 - Mercury Magnetospheric Orbiter, a component of the Mercury mapper BepiColombo
 - Mini-Mag Orion, a proposed type of spacecraft propulsion
 - Mixed metal oxide, a class of materials often used in elctrodes
 
Other
- Means, motive, and opportunity, the "indicators of suspicion"
 - Minimum municipal obligation, minimum contribution to a pension plan
 - Maio Airport, in Cape Verde, IATA code
 - Melton Mowbray railway station, England (National Rail station code MMO)
 - Marine Management Organisation, UK government body
 - Marine mammal observer, a professional in environmental consulting
 
See also
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