1. A unit of length equal to one thousandth of an inch, used in engineering and manufacturing.
Usage: technical; often used in plural form 'mils'
2. In some contexts, a prefix or combining form meaning one thousand, derived from Latin.
Usage: rare in standalone use; primarily found in compound words and scientific terminology

Examples

• The metal sheet was precisely 10 milles thick.
• Engineers measured the tolerance in milles to ensure accuracy.
• A mille is one thousandth of an inch.
• The specification called for a clearance of 5 milles between the parts.