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Definition of blastoff noun from the Oxford Advanced American Dictionary

     

    blastoff

     noun
    noun
    NAmE//ˈblæstɔf//
     
    , NAmE//ˈblæstɑf//
     
    [uncountable]
     
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  1. 1the moment when a spacecraft leaves the ground synonym lift-off
  2. 2 Blastoff is in 30 seconds.