noun: (rail transport) The station code for the Metheringham railway station in England.
noun: (film) Initialism of Metro-Goldwyn-Mayer, a US movie studio.
noun: Initialism of maternal grandmother. [Used other than figuratively or idiomatically: see maternal, grandmother. (This entry is a translation hub.)]
noun: Initialism of male genital mutilation. [The complete amputation or partial cutting of the external male genitalia, including circumcision, abbreviated as MGM.]