M

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does M mean? 

• M (noun)
  The noun M has 6 senses:

1. the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

2. concentration measured by the number of moles of solute per liter of solution

3. the cardinal number that is the product of 10 and 100

4. a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes

5. a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes

6. the 13th letter of the Roman alphabet

  Familiarity information: M used as a noun is common.

• M (adjective)
  The adjective M has 1 sense:

1. denoting a quantity consisting of 1,000 items or units

  Familiarity information: M used as an adjective is very rare.

 Dictionary entry details 

• M (noun)

Sense 1

Meaning:

The basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

Classified under:

Nouns denoting quantities and units of measure

Synonyms:

m; meter; metre

Hypernyms ("m" is a kind of...):

metric linear unit (a linear unit of distance in metric terms)

Meronyms (parts of "m"):

decimeter; decimetre; dm (a metric unit of length equal to one tenth of a meter)

Holonyms ("m" is a part of...):

dam; decameter; decametre; dekameter; dekametre; dkm (a metric unit of length equal to ten meters)

Sense 2

Meaning:

Concentration measured by the number of moles of solute per liter of solution

Classified under:

Nouns denoting attributes of people and objects

Synonyms:

M; molar concentration; molarity

Hypernyms ("M" is a kind of...):

concentration (the strength of a solution; number of molecules of a substance in a given volume)

Sense 3

Meaning:

The cardinal number that is the product of 10 and 100

Classified under:

Nouns denoting quantities and units of measure

Synonyms:

1000; chiliad; G; grand; K; M; one thousand; thou; thousand; yard

Hypernyms ("M" is a kind of...):

large integer (an integer equal to or greater than ten)

Hyponyms (each of the following is a kind of "M"):

millenary (a sum or aggregate of one thousand (especially one thousand years))

Sense 4

Meaning:

A unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes

Classified under:

Nouns denoting quantities and units of measure

Synonyms:

M; MB; megabyte

Hypernyms ("M" is a kind of...):

computer memory unit (a unit for measuring computer memory)

Meronyms (parts of "M"):

K; kB; kilobyte (a unit of information equal to 1000 bytes)

Holonyms ("M" is a part of...):

G; GB; gigabyte (a unit of information equal to 1000 megabytes or 10^9 (1,000,000,000) bytes)

Sense 5

Meaning:

A unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes

Classified under:

Nouns denoting quantities and units of measure

Synonyms:

M; MB; mebibyte; megabyte; MiB

Hypernyms ("M" is a kind of...):

computer memory unit (a unit for measuring computer memory)

Meronyms (parts of "M"):

K; kB; KiB; kibibyte; kilobyte (a unit of information equal to 1024 bytes)

Holonyms ("M" is a part of...):

G; GB; GiB; gibibyte; gigabyte (a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes)

Sense 6

Meaning:

The 13th letter of the Roman alphabet

Classified under:

Nouns denoting communicative processes and contents

Hypernyms ("M" is a kind of...):

alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)

Holonyms ("M" is a member of...):

Latin alphabet; Roman alphabet (the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe)

• M (adjective)

Sense 1

Meaning:

Denoting a quantity consisting of 1,000 items or units

Synonyms:

1000; k; m; one thousand; thousand

Similar:

cardinal (being or denoting a numerical quantity but not order)

 Context examples 

M. atlantae is normally found in human blood and is an emerging nosocomial pathogen.

(Moraxella atlantae, NCI Thesaurus)

“That makes a hundred and fifty,” the saloon-keeper calculated; “and he’s worth it, or I’m a squarehead.”

(The Call of the Wild, by Jack London)

In chemistry, M is the amount of a substance that has 6.023 x 10(23) atoms or molecules of that substance.

(Mole, NCI Dictionary)

M. timidum is found in the oral cavity and may be related to periodontitis.

(Mogibacterium timidum, NCI Thesaurus)

I'm terribly afraid of the Kalidahs.

(The Wonderful Wizard of Oz, by L. Frank Baum)

M. nonliquefaciens is a commensal organism of the upper respiratory tract but may become pathogenic in immunocompromised individuals.

(Moraxella nonliquefaciens, NCI Thesaurus)

“I don't know,” I said, pretending to be undecided, “whether I shall take a shot or not.” “Birds is got wery shy, I'm told,” said William.

(David Copperfield, by Charles Dickens)

Every minute, continued M. Krempe with warmth, every instant that you have wasted on those books is utterly and entirely lost.

(Frankenstein, by Mary Wollstonecraft Shelley)

Also called malignant mixed Müllerian tumor.

(MMMT, NCI Dictionary)

MKC-1 and its metabolites inhibit tubulin polymerization, blocking the formation of the mitotic spindle, which may result in cell cycle arrest at the G2/M phase and apoptosis.

(MKC-1, NCI Thesaurus)