A countdown is a sequence of counting backward to indicate the seconds, days, or other time units remaining before an event occurs or a deadline expires. Typical events for which a countdown is used include the launch of a rocket or spacecraft, the explosion of a bomb, the start of a race, the time until you finish work, or the New Year. Countdown was first used by the 1929 German science fiction movie "Die Frau im Mond" by Fritz Lang to increase the drama of the launch sequence of the story's lunar rocket.
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countdown A count backward indicating the time left before some event occurs.
countdown To count backward to indicate the time left before some event occurs.
