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

The Glycerin Max has all that cushioning and then some—a whole 45 millimeters, to be exact. —Lauren Wingenroth, SELF, 21 Feb. 2025

As a result, rain comes rarely and in small amounts– a few millimeters per year, on average in some parts. —Lauren Leffer, Popular Science, 20 Feb. 2025

The cacao bean grows best in temperatures up to 89 degrees Fahrenheit and with annual rainfall less than 2,000 millimeters. —Maya Huter, NBC News, 13 Feb. 2025

The units for VO2 max are millimeters/kilograms/minutes (mL/kg/min), which translates to the amount of oxygen consumed per minute relative to the person's weight. —Jakob Roze, Health, 5 Feb. 2025

Word History

Etymology

French millimètre, from milli- + mètre meter

First Known Use

1797, in the meaning defined above

Rhymes for millimeter

• amphitheater
• centimeter
• centimetre
• decimeter
• ergometer
• expositor
• gasometer
• gravimeter
• hexameter
• manometer
• milliliter
• millimetre

Kids 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

ˈmil-ə-ˌmēt-ər 

: one thousandth of a meter

—abbreviation mm