m

managed

A contact under geometry management control.

mapped

A window is said to be mapped if a map call has been performed on it. Unmapped windows and their inferiors are never viewable or visible.

modifier keys

SHIFT, CONTROL, META, SUPER, HYPER, ALT, Compose, Apple, CAPS LOCK, Shift Lock, and similar keys are called modifier keys.

monochrome

A special case of static gray, in which there are only two colormap entries.