millimetre
UKMIL-i-mee-tuh/ˈmɪlɪˌmiːtə/MIL-uh-mee-ter/ˈmɪləˌmitɚ/
Pluralmillimetres
US spellingmillimeter
- 1A unit of length equal to a thousandth of a metre, used in the SI and MKS systems and written with the symbol mm.
Leave a gap of about three millimetres between the tiles for the grout.
The bullet missed the artery by less than a millimetre.
UsageWritten mm after a number, with no s and no full stop: 3 mm.
Note
Engineering drawings usually give sizes in millimetres rather than centimetres, and in workshop talk the word is often cut short to mil: a ten-mil drill bit.
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Origin
From French millimètre.