(military) A rank of officer in the army and the US air force, between captain and lieutenant colonel. / An officer in charge of a section of band instruments, used with a modifier.

(intransitive) Used in a phrasal verb: major in.

(Britain, slang, now chiefly archaic or humorous) Mother. / (anatomy) A meninx; the dura mater, arachnoid mater, or pia mater of the brain.

(biology) Someone or something that mates.

Alternative form of 'mater (“tomato”)

A non-academic periodical publication, generally consisting of sheets of paper folded in half and stapled at the fold. / (military) An ammunition storehouse.

Of chief or leading importance; prime, principal. / Chief, most important, or principal in extent, size, or strength; consisting of the largest part.

(Britain, dialectal) Exceedingly, extremely, greatly, mightily, very, very much.

(transitive, slang) Short for mainline (“to inject (a drug) directly into a vein”). / (transitive, gaming) To mainly play a specific character or side, or with specific equipment, during a game.

That which is chief or principal; the chief or main portion; the bulk, the greater part, gross.