gm

Short definition from Wiktionary

Noun

1. 1
   Initialism of general manager.
2. 2
   Initialism of group message.
3. 3
   Initialism of game master.
4. 4
   Initialism of game master or game moderator.
5. 5
   Initialism of general manager.
6. 6
   Initialism of genital mutilation.
7. 7
   Initialism of genetic modification.
8. 8
   Initialism of gender minority.
9. 9
   Initialism of George Medal.
10. 10
    Metacentric height, a measure of a ship's static stability in roll.
11. 11
    Initialism of gold master.
12. 12
    Initialism of Grandmaster or grandmaster.
13. 13
    Initialism of gang member.

Interjection

1. 1
   Abbreviation of good morning.
2. 2
   Initialism of good morning.

Proper noun

1. 1
   Initialism of General Motors, an American multinational automotive manufacturing company headquartered in Detroit, Michigan.

Verb

1. 1
   To act as a game master or game moderator; to run a tabletop role-playing game.

Adjective

1. 1
   Initialism of genetically modified.

Symbol

1. 1
   Symbol for gigameter (gigametre), an SI unit of length equal to 10⁹ meters (metres).