From Longman Dictionary of Contemporary Englishmillimetremil‧li‧me‧tre British English, millimeter American English /ˈmɪləˌmiːtə $ -ər/ ●●○ S3 noun [countable] (written abbreviation mm) TMa unit for measuring length. There are 1,000 millimetres in one metre.
Examples from the Corpus
millimetre• Conversations with clients were tape-recorded and remote controlled 35 millimetre Olympus cameras took photographs in the bedrooms.• The bullet gouged through Michael Rentas's right hand, but it was deflected, missing his skull by a millimetre.• If an animal moves a millimetre out of the state park zones, it's dead.• Their boffins used sophisticated hospital scanners to mould the exact shape of Schuey's head to within one-tenth of a millimetre.• Cells can not normally be seen without a microscope, being about one-thousandth of a millimetre in diameter.• A tolerance of one millimetre means that the measurement has to be within one millimetre of what has been specified.• Male speaker I thought one millimetre was good enough on this kind of car. 