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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

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London and its suburbs are one of 19 English regions to have had no more than one millimetre of rainfall last month.

From Barron's Aug. 3, 2026

In Quaise's case, Kelso says, "millimetre wave drilling is really what changes that because we're not using a physical drill bit."

From BBC Jun. 25, 2026

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

From Science Daily Jan. 12, 2026

It sounds like something from the distant future, but nanotechnology - engineering at a scale of millionths of a millimetre - is already used in lots of everyday real-life tech.

From BBC Jan. 2, 2026

This pump is said to be simple and rapid in action, and capable of exhausting an 11-litre bulb from atmospheric pressure to .00001 millimetre in eighty seconds.

From The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide by Various

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