noun
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the place, region that behind some object.
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the setting or locale of the action of a play, opera, story, etc.; background.
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surroundings, esp. those behind something and providing harmony or contrast.
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the circumstances or conditions surrounding something; the events leading up to something; information which will help to explain something; background.
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music (in full background music) or sound effects used as a subordinated accompaniment to dialogue or action, as in movies.