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
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
Measuring 1220 × 420 × 220 millimeters and weighing just 92 pounds (42 kilograms), the platform is among the most compact humanoids in its category.
—Jijo Malayil, Interesting Engineering, 3 June 2026
The first laptops powered by Nvidia’s new chip will be as thin as 14 millimeters, or about a half an inch, carrying a premium price tag, and will also debut in some small desktop models.
—Katie Tarasov, CNBC, 1 June 2026
See All Example Sentences for millimeter
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
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
Measuring 1220 × 420 × 220 millimeters and weighing just 92 pounds (42 kilograms), the platform is among the most compact humanoids in its category.
—Jijo Malayil, Interesting Engineering, 3 June 2026
The first laptops powered by Nvidia’s new chip will be as thin as 14 millimeters, or about a half an inch, carrying a premium price tag, and will also debut in some small desktop models.
—Katie Tarasov, CNBC, 1 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 9 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
Love words? Need even more definitions?
Merriam-Webster unabridged
