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Definition of millimeter

millimeter

/ˈmɪl.əˌmiː.tɚ/
(UK: millimetre)
mil · li · me · ter
Plural:millimeters
•
Adjective:millimetric
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millimeter Lexical Profile

millimeter Game Scores & Validity

• noun

1

American A metric unit of length equal to one thousandth of a meter.

Example

"The architect measured the gap carefully, finding it to be exactly three millimeters wide."

2

American A tiny or almost imperceptible amount of distance.

Example

"The heavy steel door refused to budge even a single millimeter despite their combined efforts."

Synonyms
View all synonyms for millimeter
Antonyms
View all antonyms for millimeter

• Rhymes for millimeter

• Nearby Words

milligauss
milligram
milliliter
millimeter
milliner
millinery
milling

Word Origin & Etymology

Borrowed from French 'millimètre', formed from the Latin prefix 'milli-' (one thousandth) and 'mètre' (meter), ultimately deriving from the Greek 'metron' (measure).

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Millimeter. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/millimeter
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