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
Now, 42 percent of Houston’s land area is sinking faster than five millimeters (0.2 inches) per year, and 12 percent of it is sinking faster than ten millimeters (0.4 inches) per year.
—
Sara Hashemi, Smithsonian Magazine, 15 May 2025
Houston showed the highest levels, with some neighborhoods sinking more than 20 millimeters (about 0.8 inches) per year.
—Thomas Westerholm, MSNBC Newsweek, 14 May 2025
The two species share copper-colored, spotted metallic legs that resemble safari-print pants and are both about 15-17 millimeters long, about the diameter of a dime.
—Lauren Leffer, Popular Science, 14 May 2025
The beetles are tiny enough — just a few millimeters long — to crawl into the recesses of the smallest animals and nibble away without affecting delicate skeletal structures, said Scott Schaefer, who oversees the museum’s collection of more than 30 million specimens and objects.
—Corey Kilgannon, New York Times, 13 May 2025
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.
Sara Hashemi, Smithsonian Magazine, 15 May 2025
Houston showed the highest levels, with some neighborhoods sinking more than 20 millimeters (about 0.8 inches) per year.
—Thomas Westerholm, MSNBC Newsweek, 14 May 2025
The two species share copper-colored, spotted metallic legs that resemble safari-print pants and are both about 15-17 millimeters long, about the diameter of a dime.
—Lauren Leffer, Popular Science, 14 May 2025
The beetles are tiny enough — just a few millimeters long — to crawl into the recesses of the smallest animals and nibble away without affecting delicate skeletal structures, said Scott Schaefer, who oversees the museum’s collection of more than 30 million specimens and objects.
—Corey Kilgannon, New York Times, 13 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 21 May. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share