one thousandth of a metre
WordReference Random House Learner's Dictionary of American English © 2026
mil•li•me•ter /ˈmɪləˌmitɚ/USA pronunciation
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Weights and Measuresa unit of length equal to 1&sfracdenom;1000&sfracend; of a meter, equivalent to 0.03937 inch. Abbr.: mm
mil•li•me•ter
(mil′ə mē′tər),USA pronunciation n.
mil•li•met•ric
(mil′ə me′trik),USA pronunciation adj.
- Weights and Measuresa unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch. Abbr.: mm Also,[esp. Brit.,] mil′li•me′tre.
- French millimètre. See milli-, meter1
- 1800–10;
Collins Concise English Dictionary © HarperCollins Publishers::
'millimeter' also found in these entries (note: many are not synonyms or translations):
Bofors gun
- Luger
- Mike-Mike
- angstrom
- caudaite
- kilometer
- line
- mM
- milli-
- millimetre
- mm Hg
- radio wave
- snow grains
- sq. mm
- square millimeter
- submillimeter
- subminiature camera
- torr