noun
mM
noun
1
Abbreviation for millimetre, a unit of length equal to one-thousandth of a metre.
"The screw was only 3 mm in diameter."
How to Use MM
Learner’s notesIn plain EnglishThe short written form of "millimetre(s)."
Word Forms
mM plural
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The screw was only 3 _____ in diameter.