Etymology
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mil (n.)

1721, in per mil "per thousand," from Latin mille "thousand" (see million); compare percent. As a unit of length for diameter of wire (equal to .001 of an inch) it is attested from 1891; as a unit of angular measure it is recorded by 1907.

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Definitions of mil

mil (n.)
a Cypriot monetary unit equal to one thousandth of a pound;
mil (n.)
a Swedish unit of length equivalent to 10 km;
Synonyms: mile / Swedish mile
mil (n.)
a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire);
mil (n.)
a metric unit of volume equal to one thousandth of a liter;
Synonyms: milliliter / millilitre / ml / cubic centimeter / cubic centimetre / cc
mil (n.)
an angular unit used in artillery; equal to 1/6400 of a complete revolution;
From wordnet.princeton.edu