M

Ⅰ.

M [1] (also m) ► NOUN (pl. Ms or M's) 1) the thirteenth letter of the alphabet. 2) the Roman numeral for 1,000. [ORIGIN: from Latin mille.]

Ⅱ.

M [2] ► ABBREVIATION 1) male. 2) medium. 3) mega-. 4) Monsieur. 5) motorway.