MMO UK /ˌɛm.ɛmˈəʊ/US /ˌɛm.ɛmˈoʊ/ noun3 •Maximum operating Mach number; the Mach number which an aircraft should not exceed in the course of routine operation. •Initialism of massively multiplayer online game. •Initialism of methane monooxygenase, see Methane monooxygenase. formsMMOs
