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
Schlamminger said that’s a notable difference — such as measuring the height of a human and being a millimeter or two off.
—
Katie Hunt, CNN Money, 7 May 2026
Simulations and live tests To evaluate the drone interceptor, the engineers carried out computer simulations and analyzed how metal chains between three and four millimeters thick behaved when colliding with model drones.
—Georgina Jedikovska, Interesting Engineering, 6 May 2026
Scientists hope the velella can help oceanographers improve their understanding of spatial scales, from satellite images with the resolution of a football field, to aerial drone photos and microscopic images measured in millimeters, Haddock said.
—Dinah Voyles Pulver, USA Today, 6 May 2026
With modern technologies and census data, experts can draw districts to the millimeter with the goal of packing together or splitting up whole communities with like interests.
—New York Daily News Editorial Board, New York Daily News, 3 May 2026
See All Example Sentences for millimeter
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Katie Hunt, CNN Money, 7 May 2026
Simulations and live tests To evaluate the drone interceptor, the engineers carried out computer simulations and analyzed how metal chains between three and four millimeters thick behaved when colliding with model drones.
—Georgina Jedikovska, Interesting Engineering, 6 May 2026
Scientists hope the velella can help oceanographers improve their understanding of spatial scales, from satellite images with the resolution of a football field, to aerial drone photos and microscopic images measured in millimeters, Haddock said.
—Dinah Voyles Pulver, USA Today, 6 May 2026
With modern technologies and census data, experts can draw districts to the millimeter with the goal of packing together or splitting up whole communities with like interests.
—New York Daily News Editorial Board, New York Daily News, 3 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 14 May. 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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