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Noun: countdown  'kawnt,dawn
  1. Counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
Verb: count down  kawnt dawn
  1. Count backwards; before detonating a bomb, for example

Derived forms: counted down, counting down, countdowns, counts down

Type of: count, counting, enumeration, numeration, reckoning, tally

Encyclopedia: Countdown