Read the dictionary definition of mil. All definitions for this word.
1. an angular unit used in artillery; equal to 1/6400 of a complete revolution
2. a metric unit of volume equal to one thousandth of a liter
3. a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire)
4. a Swedish unit of length equivalent to 10 km
5. a Cypriot monetary unit equal to one thousandth of a pound