Meaning

noun a Cypriot monetary unit equal to one thousandth of a pound

noun a Swedish unit of length equivalent to 10 km

noun a unit of length equal to one thousandth of an inch; used to specify thickness (e.g., of sheets or wire)

originUltimately from Latin millesimum. The clippings come by way of the clipped words (e.g., millilitre, millimetre, milliradian).

Etymology from Wiktionary, CC BY-SA 3.0