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countdown1953, American English, in early use especially of launches of rockets or missiles, from count (v.) + down.
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countdownA leader at the beginning of a program, which counts backward until two seconds before the program. At two seconds, a brief audio beep is recorded as part of the countdown. cover shot:
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countdown(n) counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)
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countdownTime remaining in a predefined period.
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countdown
A count backward in fixed units to the time of some event, especially the launch of a space vehicle.
The acts of preparation carried out during this period.
A radio or television program countin [..]
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countdown
A countdown, count(ing) backward to the (starting) time of some event
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