Millimetre Meaning
/mˈɪləˌmitər/Definition, CEFR level B1, pronunciation, examples, and quiz.
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Definition
nounAn SI/MKS unit of measure, the length of ¹⁄₁₀₀₀ of a metre. Symbol: mm
Sentence Examples
A millimetre is a thousandth of a metre.
Synonyms & Antonyms
Synonyms:
Antonyms:
None
CEFR Practice Quiz
The tiny mechanical part must be accurate to within one ____ according to the engineer's blueprint.
CEFR Practice Quiz (Alternate)
In most countries using the metric system, a ____ is the standard unit of length for very small and precise objects.
Word Origin & History
From French millimètre, equivalent to milli- + metre.
Literary Quotations & Historical Citations
"It is not permissible to use abbreviations for unit symbols or unit names, such as sec (for either s or second), sq. mm (for either mm² or square millimetre), cc (for either cm³ or cubic centimetre), or mps (for either m/s or metre per second)."
— 2025 August 26, “The International System of Units (SI)”, in Bureau International des Poids et Mesures, archived from the original on 17 Sep 2025, page 147:
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CEFR Practice Quiz
The tiny mechanical part must be accurate to within one ____ according to the engineer's blueprint.
CEFR Practice Quiz (Alternate)
In most countries using the metric system, a ____ is the standard unit of length for very small and precise objects.