1. a unit of length equal to 0.001 of an inch (0.0254 mm), used in measuring the diameter of wires.
  2. a military unit of angular measurement equal to the angle subtended by 1/6400 of a circumference.
  3. (less accurately) the angle subtended by an arc equal to 1/1000 (0.001) of the radius or distance.
  4. (used formerly in pharmaceutical prescriptions) a milliliter.
  5. a former bronze coin of the mandate of Palestine, the 1/1000 part of a pound.


  1. Slang. a million.

  1. military.
  2. militia.


  1. a unit of length equal to one thousandth of an inch
  2. an obsolete pharmaceutical unit of volume equal to one millilitre
  3. a unit of angular measure, used in gunnery, equal to one sixty-four-hundredth of a circumference

the internet domain name for

  1. a US military department

abbreviation for

  1. military
  2. militia

n.1721, in per mil “per thousand,” from Latin mille “thousand” (see million); cf. percent. As a unit of length for diameter of wire, it is attested from 1891; as a unit of angular measure it is first recorded 1907.

  1. A unit of length in the US Customary System equal to 11000 of an inch (0.03 millimeter), used chiefly to measure the diameter of wires.

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