Definition of millimetre noun from the Oxford Advanced Learner's Dictionary

  

millimetre

 noun
(especially US English millimeter)noun
BrE BrE//ˈmɪlimiːtə(r)//
 
; NAmE NAmE//ˈmɪlimiːtər//
 
(abbreviation mm)
 
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a unit for measuring length; a 1 000th of a metre (informal) The bullet missed his head by a millimetre.