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Dictionary.com Unabridged (v 1.1)Cite This Source
count·down    Audio Help   [kount-doun] Pronunciation Key
–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]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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