There are 2 main definitions of gm in English:

gm1

Line breaks: gm

abbreviation

Gram(s).

Definition of gm in:

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There are 2 main definitions of gm in English:

GM2

Line breaks: GM

abbreviation

1.1(In the US) General Motors.
1.2(In the UK) George Medal.
1.3 Chess Grand master.
1.4(Of a school in the UK) grant-maintained.

Definition of gm in: