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English definition of “millimetre”

millimetre

noun [C] UK (US millimeter)     /ˈmɪl.ɪˌmiː.tər/ US  /-t̬ɚ/ (written abbreviation mm)
B1 a unit of length that is equal to 0.001 metres Measurements of length and distance
(Definition of millimetre noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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