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
In Florida, cities like Pensacola and Cedar Key reported increases of less than 4 millimeters per year, and even Key West, which is located on an island separated from the Florida mainland, reported just 3.6 millimeters, roughly half that of Rockport.
—
Theo Burman, MSNBC Newsweek, 31 May 2025
Blood pressure is measured in mm Hg (millimeters of mercury) with two numbers.
—Lauren Panoff, Verywell Health, 28 May 2025
The nation's fastest-sinking city was Houston, with more than 40% of its area dropping more than 5 millimeters (about 1/5 inch) per year, and 12% sinking at twice that rate.
—Elizabeth Weise, USA Today, 26 May 2025
This week, the researchers reported their findings in Science Advances, concluding that the fish got shorter — on the scale of a few millimeters, or a small, single-digit percent of their length — in response to the heat wave.
—Benji Jones, Vox, 23 May 2025
See All Example Sentences for millimeter
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Theo Burman, MSNBC Newsweek, 31 May 2025
Blood pressure is measured in mm Hg (millimeters of mercury) with two numbers.
—Lauren Panoff, Verywell Health, 28 May 2025
The nation's fastest-sinking city was Houston, with more than 40% of its area dropping more than 5 millimeters (about 1/5 inch) per year, and 12% sinking at twice that rate.
—Elizabeth Weise, USA Today, 26 May 2025
This week, the researchers reported their findings in Science Advances, concluding that the fish got shorter — on the scale of a few millimeters, or a small, single-digit percent of their length — in response to the heat wave.
—Benji Jones, Vox, 23 May 2025
See All Example Sentences for millimeter
Cite this Entry
“Millimeter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/millimeter. Accessed 17 Jun. 2025.
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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