Meaning of “m” in the English Dictionary

"m" in British English

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uk /əm/ us /əm/

short form of am, used in spoken and informal written English:

I'm sorry I'm late.

(Definition of “m” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"m" in American English

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m noun [ C ] (MEASUREMENT)

abbreviation formeter

Mnoun [ C ]

plural M’s, Ms, m’s or ms also m us /em/

M noun [ C ] (LETTER)

the 13th letter of the English alphabet


also m us /em/

M number (NUMBER)

the Roman numeral for the number 1000

M adjective [ not gradable ] (SIZE)

abbreviation formedium

Note: Used esp. on clothing to show its size.

(Definition of “m” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"m" in Business English

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written abbreviation for metre or meter :

The tubes are available in various sizes, all in 30m bundles.

written abbreviation for mile

written abbreviation for million :

We've managed to raise £3.3m in funding.


uk us

written abbreviation for medium, used especially in clothes sizes:

Checked skirt, size M, £35.

(Definition of “m” from the Cambridge Business English Dictionary © Cambridge University Press)