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millimetre

British  
/ ˈmɪlɪˌmiːtə /

noun

  1.  mm.  one thousandth of a metre

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The dust grains around R Doradus are typically only about one ten-thousandth of a millimetre across.

From Science Daily • Jan. 12, 2026

On production lines in most industries components will be the same size, often to within fractions of a millimetre.

From BBC • Dec. 18, 2025

"It's choreographed to the nearest millimetre," he says.

From BBC • May 14, 2025

"It can see things on the scale of a few thousandths of a millimetre," explained Adrian Mancuso, director of physical sciences at Diamond.

From BBC • Feb. 5, 2025

For spark lengths of the order of five to fifteen millimetres, the disruptive voltage in air of ordinary pressure is at the rate of 3,000 volts per millimetre.

From Hertzian Wave Wireless Telegraphy by Fleming, John Ambrose

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