G

Gamut

The range of colors available to a specific output device, such as a laserprinter or an imagesetter. If the color range is too wide for that particular device, it is referred to as 'out of gamut'.
 
For example, the RGB color range is much broader than the CMYK color gamut (which is what most pre-press output devices use). Colors specified using the RGB gamut, will often fall out of the gamut range when output.

Grid

A layout grid is the non-printing set of guidlines that designers use to align images and text in a document layout.