Definition of countdown noun from the Oxford Advanced American Dictionary

     

    countdown

     noun
    noun
    NAmE//ˈkaʊntdaʊn//
     
    countdown (to something)
     
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  1. 1[singular, uncountable] the action of counting seconds backward to zero, for example before a spacecraft is launched
  2. 2[singular] the period of time just before something important happens the countdown to the wedding