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
Aside from a split second on the slopes of the famous Mont Ventoux when a millimeter of daylight opened up between them, Pogačar has easily matched everything Vingegaard has thrown at him.
—
Issy Ronald, CNN Money, 27 July 2025
Case in point: the Olympus 6, a cushy trail runner with 33 millimeters of plush foam underfoot.
—Lauren Wingenroth, SELF, 25 July 2025
That’s not a huge number on paper, but for road cyclists dialing in long-distance performance, even 5 millimeters makes a big difference.
—Michael Teo Van Runkle, Forbes.com, 21 July 2025
Hypertension is diagnosed when blood pressure readings are consistently at or above 130/80 millimeters of mercury (mmHg).5 With routine exercise, even modest reductions in your systolic (upper) and diastolic (lower) blood pressure can influence your risk of heart disease.
—Md Published, Verywell Health, 17 July 2025
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Issy Ronald, CNN Money, 27 July 2025
Case in point: the Olympus 6, a cushy trail runner with 33 millimeters of plush foam underfoot.
—Lauren Wingenroth, SELF, 25 July 2025
That’s not a huge number on paper, but for road cyclists dialing in long-distance performance, even 5 millimeters makes a big difference.
—Michael Teo Van Runkle, Forbes.com, 21 July 2025
Hypertension is diagnosed when blood pressure readings are consistently at or above 130/80 millimeters of mercury (mmHg).5 With routine exercise, even modest reductions in your systolic (upper) and diastolic (lower) blood pressure can influence your risk of heart disease.
—Md Published, Verywell Health, 17 July 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 6 Aug. 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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