Definition of countdown noun from the Oxford Advanced Learner's Dictionary

     

    countdown

     noun
    noun
    BrE BrE//ˈkaʊntdaʊn//
     
    ; NAmE NAmE//ˈkaʊntdaʊn//
     
    countdown (to something) Space travel
     
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  1. 1[singular, uncountable] the action of counting seconds backwards to zero, for example before a spacecraft is launched Wordfinderastronaut, countdown, dock, launch, mission, orbit, rocket, satellite, space, weightless See related entries: Space travel
  2. 2[singular] the period of time just before something important happens the countdown to the wedding

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