| scenery hung at back of stage |
| (computer science) the area of the screen in graphical user interfaces against which icons and windows appear |
| a person's social heritage: previous experience or training |
| the part of a scene (or picture) that lies behind objects in the foreground |
| information that is essential to understanding a situation or problem |
| extraneous signals that can be confused with the phenomenon to be observed or measured |
| relatively unimportant or inconspicuous accompanying situation |
| the state of the environment in which a situation exists |