# millimetre

Pronunciation: UK say "MIL-i-mee-tuh" /ˈmɪlɪˌmiːtə/; US say "MIL-uh-mee-ter" /ˈmɪləˌmitɚ/

## Noun

1. A unit of length equal to a thousandth of a metre, used in the SI and MKS systems and written with the symbol mm.
   - Simple: A very small unit for measuring length. There are 1,000 of them in a metre.
   - _Leave a gap of about three millimetres between the tiles for the grout._
   - _The bullet missed the artery by less than a millimetre._

## Origin

From French millimètre.

Source: DictionaryAI, https://dictionaryai.com/define/millimetre (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).