Definition of M

Noun

• the 13th letter of the Roman alphabet
  
• a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
  megabyte - mebibyte - mb mib
• a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes
  megabyte - mb
• the cardinal number that is the product of 10 and 100
  thousand - one thousand - 1000 - k chiliad - g grand thou yard
• concentration measured by the number of moles of solute per liter of solution
  molarity - molar concentration
• the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)
  meter metre

Adjective

• denoting a quantity consisting of 1,000 items or units
  thousand - one thousand - 1000 - k

Word games points for the M

• Scrabble® score of the m (3)
• Word Chums® score of the m (5)
• Words With Friends® score of the m (4)