1. The 13th letter of the Roman alphabet
   - M, em
    
2. The basic unit of length adopted under the Système International d'Unités (approximately 1.094 yards)
   - meter [US], metre [Brit, Cdn]

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

1. A unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes
   - megabyte, MB
    
2. The cardinal number that is the product of 10 and 100
   - thousand, one thousand, 1000, K, G, thou [informal]
    
3. Concentration measured by the number of moles of solute per litre of solution
   - molarity, molar concentration
    
4. A unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
   "The document was about 5 Ms in size";
   - megabyte, mebibyte, MB, MiB

Derived forms: Ms, ms

See also: cardinal

Type of: alphabetic character, computer memory unit, concentration, large integer, letter, letter of the alphabet, metric linear unit

Part of: dam, decameter [US], decametre [Brit, Cdn], dekameter [US], dekametre [Brit, Cdn], dkm [Brit], G, GB, GiB, gibibyte, gig [informal], gigabyte, Latin alphabet, Roman alphabet

Encyclopedia: M,beta-dihydroxyamphetamine