G.M.

1. General Manager.

2. Grand Marshal.

3. Grand Master.

Also, GM.

* * *

gm.,

gram or grams.

GM (no periods),

1. guided missile.

2. gunner's mate.

3. genetically modified.

G.M.,

1. general manager.

2. (in Great Britain) George Medal.

3. grand marshal.

4. (in Freemasonry) Grand Master.

5. genetically modified.