The process of defining an area of an image or layer for selection, modification, or transparency.
merge
In the context of layers, merging refers to combining some of the layers in a design while keeping other layers separate.
mode
A way to apply editing and painting techniques. Palettes have Mode drop-down lists.
See also [palette]
multiple views
More than one window opened for a single image file. You can open two separate windows of the same file, specify a high rate of magnification for editing in one window, and leave the other at full screen size to check your progress as you work.