mil·li·me·ter | \ˈmi-lə-ˌmē-tər \
variants: or British millimetre

Definition of millimeter 

: a unit of length equal to ¹/₁₀₀₀ meter — see Metric System Table

Examples of millimeter in a Sentence

Recent Examples on the Web

This revealed a bulky, moving-parts system that constantly shifted a headset's lenses with sub-millimeter precision. Sam Machkovech, Ars Technica, "Oculus reveals its next big VR trick: Wider-FOV lenses that automatically move," 2 May 2018 In 1946, at 22, Mr. Miller bought an eight-millimeter movie camera and headed from Los Angeles to Sun Valley, Idaho, a winter playground for the likes of Ernest Hemingway. Matt Higgins, New York Times, "Warren Miller, Ski Bum Turned Filmmaker, Is Dead at 93," 25 Jan. 2018 The 65-degree head angle and 205 millimeters of suspension travel also split the difference between mountain and dirt bikes. Ty Brookhart, Outside Online, "You're Going to Want the Cake Kalk E-Dirt Bike," 25 June 2018 Normal blood pressure is 120/80 mmHg (millimeters of mercury) or less. Cara Rosenbloom,, "Ignore calories and BMI. Here are the health numbers that really matter.," 9 July 2018 The Post’s Chris Mooney reports the mantle of the Earth under several major glaciers seems to be rebounding, rising upward at a rate of 41 millimeters (or 1 ½ inches) a year. Dino Grandoni, Washington Post, "The Energy 202: Trump's plan to overhaul government would give Interior and EPA more power," 22 June 2018 The amount of the horizontal stretching measured is tiny — about 3 millimeters (0.12 inch) — but enough to stress faults, according to the researchers. Fox News, "Study: 2014 Napa quake may be linked to groundwater changes," 13 June 2018 An easy choice Even now, there is a margin of error of one to two millimeters in where the information overlay gets placed, Mount Sinai’s Dr. Bederson says. Sarah Toy, WSJ, "Brain Surgeons Get a Better View From Augmented Reality," 28 May 2018 Currently, sea levels are rising at a rate of roughly 3 millimeters per year. NBC News, "Here's how rising seas could swallow up these coastal cities," 9 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'millimeter.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of millimeter

1797, in the meaning defined above

History and Etymology for millimeter

French millimètre, from milli- + mètre meter

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Last Updated

8 Oct 2018

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Time Traveler for millimeter

The first known use of millimeter was in 1797

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More Definitions for millimeter



English Language Learners Definition of millimeter

: a length equal to 1/1000 meter


mil·li·me·ter | \ˈmi-lə-ˌmē-tər \

Kids Definition of millimeter

: a unit of length equal to 1/1000 meter


variants: or chiefly British millimetre \ˈmil-ə-ˌmēt-ər \

Medical Definition of millimeter 

: one thousandth of a meter abbreviation mm

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