What is the meaning of M?

The thirteenth letter of the basic modern Latin alphabet.

metre (U.S. meter), the unit of length in the International System of Units

milli-

used in the International Phonetic Alphabet and in several romanization systems of non-Latin scripts to represent the voiced bilabial nasal (/m/), including Cyrillic м (em), the beginning of various kana including ま (ma), and Korean jamo ㅁ (mieum).

[m]-prenasalization, [m]-release or post-nasalization, [m]-coloring, or a weak, fleeting or epenthetic [m].

mass

month or months

million (since mid-20th century)

thousand (M being the Roman numeral for 1,000)

minor

mezzo, as in mezzo piano and mezzo forte

Of a tactic diad, having structural units in identical orientation.

The cardinal number one thousand (1000).

The thirteenth letter of the English alphabet, called em and written in the Latin script.

Abbreviation of masculine.

Abbreviation of meter.

Abbreviation of mile.

Abbreviation of month.

Abbreviation of minute.

Abbreviation of million.

Abbreviation of minim (“unit of volume”).

Abbreviation of measure.

thousand

make

breast

in

in, for, during

into

from within, out of, from

made of, consisting of

consisting of, comprising

by means of

in a state of

in the capacity of, in the role of, as, being

together with, along with

forms the periphrastic imperfective of a verb

behold, lo, look

whether, although

imperative of jmj (“to not be, to not do”): don't

I, first-person singular pronoun

Contraction of mwen.

five

The nineteenth letter of the Livonian alphabet, written in the Latin script.

Nonstandard spelling of m̄.

Nonstandard spelling of ḿ.

Nonstandard spelling of m̌.

Nonstandard spelling of m̀.

I, me (personal pronoun)

The thirteenth letter of the Norwegian alphabet, written in the Latin script.

The sixteenth letter of the Nupe alphabet, written in the Latin script.

The twenty-first letter of the Skolt Sami alphabet, written in the Latin script.

eat

The nineteenth letter of the Azerbaijani alphabet, written in the Latin script.

The thirteenth letter of the Basque alphabet, called eme and written in the Latin script.

The thirteenth letter of the Dutch alphabet, written in the Latin script.

The sixteenth letter of the Esperanto alphabet, called mo and written in the Latin script.

The thirteenth letter of the Estonian alphabet, called emm and written in the Latin script.

The fifteenth letter of the Faroese alphabet, written in the Latin script.

The thirteenth letter of the Finnish alphabet, called äm or em and written in the Latin script.

Abbreviation of miehet (“gentlemen”) (used to mark toilets and similar installations to be for men only)

The thirteenth letter of the French alphabet, written in the Latin script.

A letter of the Fula alphabet, written in the Latin script.

Romanization of 𐌼

m (the unit of length in the International System of Units)

The twenty-first letter of the Hungarian alphabet, called emm and written in the Latin script.

The sixteenth letter of the Icelandic alphabet, written in the Latin script.

The thirteenth letter of the Ido alphabet, written in the Latin script.

The nineteenth letter of the Igbo alphabet, written in the Latin script.

(personal) I, me

The thirteenth letter of the Indonesian alphabet, written in the Latin script.

The eleventh letter of the Italian alphabet, called emme and written in the Latin script.

The eighteenth letter of the Kashubian alphabet, written in the Latin script.

The letter of the Latin alphabet, written in the Latin script.

The twentieth letter of the Latvian alphabet, called em and written in the Latin script.

The thirteenth letter of the Malay alphabet, written in the Latin script.

The seventeenth letter of the Maltese alphabet, written in the Latin script.

The seventeenth letter of the Polish alphabet, called em and written in the Latin script.

The thirteenth letter of the Portuguese alphabet, written in the Latin script.

The seventeenth letter of the Romani alphabet, written in the Latin script.

The eighteenth letter of the Romani alphabet, written in the Latin script.

The sixteenth letter of the Romanian alphabet, called em, me, or mî and written in the Latin script.

The eleventh letter of the Scottish Gaelic alphabet, written in the Latin script. It is preceded by l and followed by n. Its traditional name is muin (“vine”).

Abbreviation of sa mhadainn (“in the morning, ante meridiem”); am, a.m.

The 18th letter of the Serbo-Croatian Latin alphabet, preceded by lj and followed by n.

masculine gender

meter (unit of length)

The sixteenth letter of the Silesian alphabet, written in the Latin script.

The thirteenth letter of the Spanish alphabet, written in the Latin script.

Abbreviation of me.

you all are; thou all art

w/, with; Abbreviation of med.

Moderate Party; Abbreviation of Moderaterna.

The thirteenth letter of the Tagalog alphabet (the Filipino alphabet), called em and written in the Latin script.

The tenth letter of the Tagalog alphabet (the Abakada alphabet), called ma and written in the Latin script.

The fifteenth letter of the Tagalog alphabet (the Abecedario), called eme and written in the Latin script.

The sixteenth letter of the Turkish alphabet, called me and written in the Latin script.

The fifteenth letter of the Turkmen alphabet, called em and written in the Latin script.

Combining stem of mna used with possessive concords.

Combining stem of mna.

The fourteenth letter of the Yoruba alphabet, called mí and written in the Latin script.

Standard spelling of n̄ (“I”)

Standard spelling of ń (“imperfect aspect marker”)

The thirteenth letter of the Zulu alphabet, written in the Latin script.

Source: wiktionary.org