DictionaryAI

millimetre

noun
UKMIL-i-mee-tuh/ˈmɪlɪˌmiːtə/MIL-uh-mee-ter/ˈmɪləˌmitɚ/

Pluralmillimetres

US spellingmillimeter

1 meaning of millimetre

Practice

  1. 1
    nouncountable
    A very small unit for measuring length. There are 1,000 of them in a metre.

    The rain gauge showed just one millimetre of rain this morning.

    My new ruler is marked in centimetres and millimetres.

    UsageWrite mm after a number: 3 mm.

    Note

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Origin

English took it from the French word millimètre.

Checked 5 Nov 2026 · 1 fact