Countdown
[kount-doun] /ˈkaʊntˌdaʊn/
noun
1.
the backward counting in fixed time units from the initiation of a project, as a rocket launching, with the moment of firing designated as zero.
2.
the final preparations made during this period.
3.
a period of increasing activity, tension, or anxiety, as before a deadline.
/ˈkaʊntˌdaʊn/
noun
1.
the act of counting backwards to time a critical operation exactly, such as the launching of a rocket or the detonation of explosives
verb (intransitive, adverb)
2.
to count numbers backwards towards zero, esp in timing such a critical operation
n.
1953, American English, in early use especially of launches of rockets or missiles, from count (v.) + down.
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