Mil can refer to a number of different things.

• In English units of measurement, a mil is:
  • a unit of length 1/1000 inch long, also called a thou, commonly used in the context of English units for manufacturing specifications and tolerances.
  • a unit of angle: see angular mil
  • a unit of surface (square mil), a square one mil on each side
  • a unit of surface (circular mil), a circle one mil across

• The term 'mil' is also used colloquially to mean 'millimetre' or 'millilitre'.

• A mil in Norway and Sweden is a distance of 10 kilometres. The term originates from a pre-metric mil (in earlier times rast) of slightly over 10 km, denoting a suitable distance between rests when walking. The metric mil was officially established in Sweden on 1 January 1889. In informal and non-precise situations when geographical distances of more than a few kilometers are treated, the mil is, as a rule, used instead of the kilometre. It is also used commonly for measuring vehicle fuel consumption, litre per mil means litres consumed per 10 km [1].

• mil is sometimes used as an abbreviation for millions.

• .mil is the top level domain for the US Military

• MIL-SPEC is short for Military Specification, for equipment or materiel.

• Mil is the short name of a Soviet/Russian helicopter manufacturer: see Mil Moscow Helicopter Plant.

See also: mill