backgrounding

from WordNet (r) 3.0 (2006)

backgrounding
    n 1: the execution of low priority programs while higher
         priority programs are not using the processing system [syn:
         {background processing}, {backgrounding}]

from The Collaborative International Dictionary of English v.0.48

backgrounding \back"ground*ing\ n. (Computers)
   The execution of low priority programs while higher priority
   programs are not using the processing system.

   Syn: background processing
        [WordNet 1.5]

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