There are 2 definitions of mm in English:

mm1

Syllabification: mm

abbreviation

Millimeter(s).

Definition of mm in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of mm in English:

MM2

Syllabification: MM

abbreviation

Messieurs.

Definition of mm in: