n A group or set with six elements.
n The digit or figure 6.
n Six o'clock.
n (military slang, by ellipsis of six o'clock) Rear, behind (rear side of something).
n (cricket, countable) An event whereby a batsman hits a ball which does not bounce before passing over a boundary in the air, resulting in an award of 6 runs for the batting team.
n (American football) A touchdown.
n (North Wales) A bathroom or toilet.
n (obsolete) Small beer sold at six shillings per barrel.
n A surname.
n (UK) Abbreviation of MI6. (intelligence service) [The overseas intelligence agency of the United Kingdom, whose primary function is to spy on foreign governments and terror groups located abroad. Formally called the Secret Intelligence Service (SIS).]