(biochemistry) Initialism of granulocyte-macrophage colony-stimulating factor.

That does not contain any genetically modified material

The fact that the arithmetic mean of nonnegative numbers is not less than their geometric mean, and is more if some of the numbers are distinct.

Initialism of Greenwich Mean Time.

(trademark) A web-based e-mail system provided by Google (trademarked Gmail).

To send some one an e-mail using Gmail.

Initialism of Greater Manchester Radio.

Initialism of giant magnetoresistance.

Initialism of giant magnetoresistive.

(politics, UK) Initialism of General Management Committee. (the general committee of a constituency party of the British Labour Party.)