mens sana in corpore sano (L.). A sound mind in a sound body.
menu (Fr.). A bill of fare.
meum et tuum (L.). Mine and thine.
mirabile dictu, (visu) (L.). Wonderful to relate, (to see).
modus operandi (L.). Manner of working.
mon ami (Fr.). My friend (masc.).
mon cher (Fr.). My dear (masc.).
more suo (L.). In his own way.
multum in parvo (L.). Much in little.
mutatis mutandis (L.). The necessary changes being made.