Definitions from Wiktionary ( )

▸ adjective:  Less important or less noticeable in a scene or system.
▸ noun:  One's social heritage, or previous life; what one did in the past.
▸ noun:  A part of the picture that depicts scenery to the rear or behind the main subject; context.
▸ noun:  (film) An extra who appears in the background, with no speaking role.
▸ noun:  Information relevant to the current situation about past events; history.
▸ noun:  A less important feature of scenery (as opposed to foreground).
▸ noun:  (computing) The image or color over which a computer's desktop items are shown (e.g. icons or application windows).
▸ noun:  (computing) A type of activity on a computer that is not normally visible to the user.
▸ verb:  (transitive) To put in a position that is not prominent.
▸ verb:  (journalism) To gather and provide background information (on).
▸ verb:  (transitive) To 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.
▸ noun:  (physics) Clipping of background radiation. [ionizing radiation that is naturally present in the environment.]

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