noun

• (film) An extra who appears in the background, with no speaking role.
• (computing) The image or color over which a computer's desktop items are shown (e.g. icons or application windows).
• (computing) A type of activity on a computer that is not normally visible to the user.
  "The antivirus program is running in the background."
• (physics) Ellipsis of background radiation.
  "low-background"

verb

• (transitive) To place in the background.
  "Ha! I see Venus’ transit now;—lo! a new planet there;—and behind all, an infinite starry nebulousness, as if thy being were backgrounded by some spangled vail of mystery."
• (transitive, figurative) To put in a position that is not prominent.
  "One aspect of the story that appears interesting is that the alleged rapist and victim are only referred to by name together in the same sentence once. In all the other sentences, one receives more focus, while the other is backgrounded."
• (journalism) To gather and provide background information (on).
• (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.