Meaning of M in English

M

/ em; NAmE / noun , abbreviation , symbol

■ noun

(also m ) [ C , U ] ( pl. Ms , M's , m's / emz/) the 13th letter of the English alphabet :

'Milk' begins with (an) M / 'M'.

■ abbreviation

1.

(also med. ) (especially for sizes of clothes) medium :

S M and L (= small, medium and large)

2.

(used with a number to show the name of a British motorway ) :

heavy traffic on the M25

■ symbol

(also m ) the number 1 000 in Roman numerals

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.