1. an informal abbreviation for million in expressions such as "$500M" for 500 million dollars or "Unemployment Reaches 4M" in a newspaper headline. In binary contexts such as computer memory, M often represents 220 = 1 048 576 (see mebi-, below).
   2. the Roman numeral 1000, sometimes used in symbols to indicate a thousand, as in Mcf, a traditional symbol for 1000 cubic feet. Given the widespread use of M to mean one million, this older use of M to mean one thousand is very confusing and should be scrapped.
   3. the symbol for "molar" in chemistry.
   4. see morgan
   5. see molal
   6. see Mach

Dictionary of units of measurement. 2015.

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