abbreviation
1. machinist's mate
2. made merchantable
3. Maelzel's metronome
4.
[Latin magistri ]
masters
5. Majesties
6.
[Latin, martyres ]
martyrs
7. master mechanic
8. mercantile marine; merchant marine
9.
[French]
messieurs
10. methyl methacrylate
11. middle marker
12. often not capitalized
[Latin]
mutatis mutandis