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
They were stunned to discover thriving ecosystems made up of millimeter-sized organisms clinging to exposed rock surfaces in near-freezing darkness.
—
Georgina Jedikovska, Interesting Engineering, 28 May 2026
It's made with deep five-millimeter lugs that are seriously grippy on all kinds of terrain from mud to rocks, and its special midsole absorbs a ton of impact to keep your feet pain-free and without fatigue for as long as possible.
—Jasmine Gomez, Travel + Leisure, 23 May 2026
Each is separately spring-loaded, depressing four millimeters at most (though they can be actuated with as little as two millimeters of travel) before bouncing back with a confirming click.
—Literary Hub, 19 May 2026
It’s further refined with woodworking tools (such as this hand plane), allowing craftsmen to make adjustments of less than a millimeter in some sections.
—Justin Fenner, Robb Report, 17 May 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.
Georgina Jedikovska, Interesting Engineering, 28 May 2026
It's made with deep five-millimeter lugs that are seriously grippy on all kinds of terrain from mud to rocks, and its special midsole absorbs a ton of impact to keep your feet pain-free and without fatigue for as long as possible.
—Jasmine Gomez, Travel + Leisure, 23 May 2026
Each is separately spring-loaded, depressing four millimeters at most (though they can be actuated with as little as two millimeters of travel) before bouncing back with a confirming click.
—Literary Hub, 19 May 2026
It’s further refined with woodworking tools (such as this hand plane), allowing craftsmen to make adjustments of less than a millimeter in some sections.
—Justin Fenner, Robb Report, 17 May 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 4 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
