metronome marking vs M.M.

metronome marking and M.M. both are nouns.

Word	Noun	Adjective	Verb	Adverb
metronome marking	Yes	No	No	No
M.M.	Yes	No	No	No

As nouns, metronome marking and M.M. are synonyms defined as:

metronome marking and M.M.: the pace of music measured by the number of beats occurring in 60 seconds

Other synonyms of metronome marking include beats per minute, bpm.

metronome marking (noun)	M.M. (noun)
the pace of music measured by the number of beats occurring in 60 seconds	the pace of music measured by the number of beats occurring in 60 seconds