What is the meaning of M?

noun

• The basic unit of length adopted under the Systeme International d'Unites (approximately 1. 094 yards.
  • synonyms: meter, metre
• Concentration measured by the number of moles of solute per liter of solution.
  • synonyms: molarity, molar concentration
• The cardinal number that is the product of 10 and 100.
  • synonyms: thousand, one thousand, 1000, K, chiliad, G, grand, thou, yard
• A unit of information equal to 1000 kilobytes or 10^6 (1, 000, 000) bytes.
  • synonyms: megabyte, MB
• A unit of information equal to 1024 kibibytes or 2^20 (1, 048, 576) bytes.
  • synonyms: megabyte, mebibyte, MB, MiB
• The 13th letter of the Roman alphabet.

adjective

• Denoting a quantity consisting of 1, 000 items or units.
  • synonyms: thousand, one thousand, 1000, k