# millimeter

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

## Noun

1. A unit of length in the SI and MKS systems, equal to one thousandth of a meter and written with the symbol mm.
   - Simple: A very small unit for measuring length. A meter has 1,000 of them. Its short form is mm.
   - _The mechanic adjusted the gap by half a millimeter until the door closed smoothly._
   - _Forecasters expect up to 20 millimeters of rain overnight._

## Origin

Borrowed from French millimètre, and read in English as if formed from milli- + meter.

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