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
military
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Merriam-Webster unabridged
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