millimetre

noun

1. An SI/MKS unit of measure, the length of ¹⁄₁₀₀₀ of a metre. Symbol: mm

   “Holonyms: centimetre < decimetre < metre < kilometre < megametre < gigametre < terametre < petametre”

   “Meronyms: picometre < nanometre < micrometre”

   “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).”