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Definition of M: 1. A brand or stigma, having the shape of an M, formerly impressed on one convicted of manslaughter and admitted to the benefit of clergy.
2. A quadrat, the face or top of which is a perfect square.
3. As a numeral, stands for one thousand, both in English and Latin.
4. M, the thirteenth letter of the English alphabet, is a vocal consonant, and from the manner of its formation, is called the labio-nasal consonant. See Guide to Pronunciation, 178-180, 242.

Synonyms:

eighty, manor, Dec., metre, large, thousand, in., macho man, min., B-road, s., astronomical unit, nanosecond, billion, cardinal, Sat., available, male, microsecond, ft., blacktop, half-hour, Apr., molar concentration, centimetre, Saturday, family man, eleven, v, chiliad, live-in, mediaeval, CCTV, cf., lone, c, millisecond, artery, foot, Friday, d, footloose, cardinal number, Mon., k, hour, aitch, guy, kilometre, inch, a, divorced, Capt., young man, calendar month, date, G, meter, a thousand, fellow, league, fancy-free, alchemy, byroad, liege, Monday, lord, b, lad, boulevard, Sunday, fifteen, feudalism, bpi, anon., avenue, approach, e, Sun., Pt., molarity, acronym, AV, medium, April, mi., grand, Jan., thou, bore, byway, minute, Atoll, fifty, cape, km, alchemist, August, eighteen, length, light year, cm., yard, Fri., f, i, bypass, December, boy, estranged, abbreviation, Feb., engaged, h, gentleman, beltway, common law, de facto, Roman numeral, pk., mount, l, Mt., bluff, apt., 1000, hr., food mile, short, crore, Aug., five, centimeter, olde, x, medieval, ABC's, February, cubit, eight, XL, feudal, boy wonder, one thousand, kilometer

See how do you define M. See M definition.