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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   meteor
       n 1: (astronomy) any of the small solid extraterrestrial bodies
            that hits the earth's atmosphere [syn: meteoroid,
            meteor]
       2: a streak of light in the sky at night that results when a
          meteoroid hits the earth's atmosphere and air friction causes
          the meteoroid to melt or vaporize or explode [syn: meteor,
          shooting star]