Meaning of “countdown” in the English Dictionary

british dictionary

(Definition of “countdown” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"countdown" in American English

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countdownnoun [ C ]

us /ˈkɑʊntˌdɑʊn/

an act of counting backwards to zero, esp. before sending a spacecraft into space or before the start of an important event:

The countdown to Tuesday’s primary elections has begun.

(Definition of “countdown” from the Cambridge Academic Content Dictionary © Cambridge University Press)