The Garand semiautomatic rifle, also named the United States Rifle, Caliber .30, M1.

(euphemistic) The word motherfucker, regarded as a vulgar or taboo word.

(computing, historical) An early 8-bit operating system.

(military) Abbreviation of mobilization day.

(nautical) Initialism of motor vessel.

(nautical) Initialism of motor ship. – a ship propelled by an internal combustion engine, such as a diesel engine, in contrast to sailing ships and steamships

(fandom slang) The ship of characters Fox Mulder and Dana Scully from the television series The X-Files.

Alternative spelling of S&M

(Internet slang) Abbreviation of never mind.

(linguistics) Initialism of Merriam-Webster.