Webster's English Dictionary

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background

back.ground \-.grau.nd\ n 1a: the scenery or ground behind something seen 
   or represented  1b: the part of a painting representing what lies behind 
   objects in the foreground 2: an inconspicuous position  3a: the natural 
   conditions that form the setting within which something is experienced 
   3b1: the circumstances or events antecedent to a phenomenon or development  
   3b2: information essential to understanding of a problem or situation  3c: 
   the total of a person's experience, knowledge, and education  4: intrusive 
   sound that interferes with received electronic signals