Noun

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

Adjective

• S: (adj) thousand, one thousand, 1000, m, k (denoting a quantity consisting of 1,000 items or units)