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
For instance, Quaise Energy has developed a millimeter-wave drilling technology that can vaporize rock using high-frequency electromagnetic waves rather than conventional drill bits.
—
Georgina Jedikovska, Interesting Engineering, 10 Oct. 2025
For cinephiles, this feature, shot on 16-millimeter film, will likely feel like a successor to John Waters’ dynasty of filth, down to its setting in the fictional urban sprawl of Trashtown.
—Elaina Patton, NBC news, 9 Oct. 2025
Because of their history servicing the Navy, the watches are large, ranging from 38 millimeters to 47 millimeters, are rigorously tested to be water-resistant to as much as 500 meters, and are durable.
—Jean E. Palmieri, Footwear News, 9 Oct. 2025
Luigi Avantaggiato PacBio’s Wenger notes that the 25-million-well chips that underpin its Revio system are still being fabricated on 200-millimeter semiconductor wafers.
—IEEE Spectrum, 2 Oct. 2025
See All Example Sentences for millimeter
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Georgina Jedikovska, Interesting Engineering, 10 Oct. 2025
For cinephiles, this feature, shot on 16-millimeter film, will likely feel like a successor to John Waters’ dynasty of filth, down to its setting in the fictional urban sprawl of Trashtown.
—Elaina Patton, NBC news, 9 Oct. 2025
Because of their history servicing the Navy, the watches are large, ranging from 38 millimeters to 47 millimeters, are rigorously tested to be water-resistant to as much as 500 meters, and are durable.
—Jean E. Palmieri, Footwear News, 9 Oct. 2025
Luigi Avantaggiato PacBio’s Wenger notes that the 25-million-well chips that underpin its Revio system are still being fabricated on 200-millimeter semiconductor wafers.
—IEEE Spectrum, 2 Oct. 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 15 Oct. 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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