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18.216.48.1
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From: WordNet (r) 2.0

 cosmic background radiation
      n : (cosmology) the cooled remnant of the hot big bang that
          fills the entire universe and can be observed today with
          an average temperature of about 2.725 kelvin [syn: CBR,
           cosmic microwave background radiation, CMBR, cosmic
           microwave background, CMB]