Definition of mil
1
: thousand
- found a salinity of 38.4 per mil
2
: a monetary unit formerly used in Cyprus equal to ¹/₁₀₀₀ pound
3
: a unit of length equal to ¹/₁₀₀₀ inch used especially in measuring thickness (as of plastic films)
4
: a unit of angular measurement equal to ¹/₆₄₀₀ of 360 degrees and used especially in artillery
