millimeter
noun
mil·li·me·ter
ˈmi-lə-ˌmē-tər 
variants
US millimeter
or British millimetre
: a unit of length equal to 1/1000 meter see Metric System Table
Examples of millimeter in a Sentence
Recent Examples on the Web
To improve stability, the grass for the World Cup has been studded with plastic fibers, sewn in about every five millimeters by a machine that looks like a Zamboni.
—
Hana Kiros, The Atlantic, 10 June 2026
Engineers at the University of California San Diego have built a tiny optical component measuring just six millimeters in diameter for telescopes.
—Mrigakshi Dixit, Interesting Engineering, 10 June 2026
The jets have six underwing mounts for bombs or rockets as well as a 25-millimeter cannon that can fire 300 rounds, according to the Wings Over the Rockies aviation museum.
—Brad Lendon, CNN Money, 4 June 2026
Upcoming releases include a new titanium collection built using 6-millimeter titanium — thicker than the typical industry standard and requiring specialized industrial presses available at only a handful of facilities in Japan.
—Thomas Waller, Footwear News, 4 June 2026
See All Example Sentences for millimeter
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Hana Kiros, The Atlantic, 10 June 2026
Engineers at the University of California San Diego have built a tiny optical component measuring just six millimeters in diameter for telescopes.
—Mrigakshi Dixit, Interesting Engineering, 10 June 2026
The jets have six underwing mounts for bombs or rockets as well as a 25-millimeter cannon that can fire 300 rounds, according to the Wings Over the Rockies aviation museum.
—Brad Lendon, CNN Money, 4 June 2026
Upcoming releases include a new titanium collection built using 6-millimeter titanium — thicker than the typical industry standard and requiring specialized industrial presses available at only a handful of facilities in Japan.
—Thomas Waller, Footwear News, 4 June 2026
See All Example Sentences for millimeter
Cite this Entry
“Millimeter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/millimeter. Accessed 18 Jun. 2026.
Copy CitationKids Definition
millimeter
noun
mil·li·me·ter
ˈmil-ə-ˌmēt-ər
: a measure of length equal to ¹⁄₁₀₀₀ meter see metric system table
Medical Definition
millimeter
noun
mil·li·me·ter
variants
or chiefly British millimetre
: one thousandth of a meter
—abbreviation mm
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