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countdown - 2 dictionary results

count⋅down

[kount-doun]
–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.

Origin:
1950–55, Americanism; n. use of v. phrase count down
count·down   (kount'doun')   
n.  
  1. The counting backward aloud from an arbitrary starting number to indicate the time remaining before an event or operation, such as the launching of a missile or space vehicle.
  2. The checks and preparations carried out during this activity.
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