mil 1 (m?l)n.1. A unit of length equal to one thousandth (10-3) of an inch (0.0254 millimeter), used, for example, to specify the diameter of wire or the thickness of materials sold in sheets.2. A milliliter; one cubic centimeter.3. A unit of angular measurement used in artillery and equal to 1/6400 of a complete revolution.[Short for Latin m?ll?simus, thousandth, from m?lle, thousand; see gheslo- in Indo-European roots.]mil 2 (m?l)n. Slang A million dollars.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.mil (m?l) n1. (Units) a unit of length equal to one thousandth of an inch2. (Units) an obsolete pharmaceutical unit of volume equal to one millilitre3. (Units) a unit of angular measure, used in gunnery, equal to one sixty-four-hundredth of a circumference[C18: short for Latin mill?simus thousandth]mil the internet domain name for (Computer Science) a US military department Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014mil1 (m?l) n. 1. a unit of length equal to 0.001 of an inch (0.0254 mm), used in measuring the diameter of wires. 2. a military unit of angular measurement equal to the angle subtended by 1/6400 of a circumference. 3. (used formerly in pharmaceutical prescriptions) a milliliter. [1715?25; short for Latin mill?simus thousandth] mil2 (m?l) n. Slang. a million. [by shortening] mil. 1. military. 2. militia. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.mil (m?l) A unit of length equal to 0.001 of an inch (0.03 millimeter), used chiefly to measure the diameter of wires.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.