What is gm meaning?

GM can mean many things, depending on the context it is used in. Here are some possibilities:

1. General Motors - a well-known American automobile manufacturer.
2. Genetically modified - refers to organisms whose DNA has been altered in some way using biotechnology.
3. Game Master - a person who runs a tabletop RPG (roleplaying game) and controls the plot, environment, and non-player characters.
4. Grandmaster - the highest rank attainable in chess.
5. Good morning - a greeting commonly used at the beginning of a day.