M, m

/em/, n., pl. M's or Ms, m's or ms.

1. the thirteenth letter of the English alphabet, a consonant.

2. any spoken sound represented by the letter M or m, as in my, summer, or him.

3. something having the shape of an M.

4. a written or printed representation of the letter M or m.

5. a device, as a printer's type, for reproducing the letter M or m.

6. Print. em.