Definitions
1.AdjectiveLess important or less noticeable in a scene or system."background noise; The antivirus program runs on a background thread."
2.NounOne's social heritage, or previous life; what one did in the past."The lawyer had a background in computer science."
3.NounA part of the picture that depicts scenery to the rear or behind the main subject; context.
4.NounAn extra who appears in the background, with no speaking role.
5.NounInformation relevant to the current situation about past events; history.
6.NounA less important feature of scenery (as opposed to foreground)."There was tons of noise in the background.; The photographer let us pick a background for the portrait."
7.NounThe image or color over which a computer's desktop items are shown (e.g. icons or application windows).
8.NounA type of activity on a computer that is not normally visible to the user."The antivirus program is running in the background."
9.NounEllipsis of background radiation."low-background"
10.VerbTo place in the background.
11.VerbTo put in a position that is not prominent.
12.VerbTo gather and provide background information (on).
13.VerbTo increase the weight and immunity of (a calf) by feeding with forage and grains, as an intermediate stage in cattle production, between weaning and placement in a feedlot.
14.Verbsimple past and past participle of backgrind