There are 2 definitions of mm in English:

mm

Line breaks: mm

abbreviation

Millimetre(s).

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar

There are 2 definitions of mm in English:

MM

Line breaks: MM
Pronunciation: /ɛmˈɛm
 
/

abbreviation

1Maelzel’s metronome (an indication of tempo in music, given as the number of beats per minute).
[with reference to the metronome invented by Johann N. Maelzel (died 1838)]
1.1Messieurs.
1.2(In the UK) Military Medal.

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