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countdown

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia 0.03 sec.
countdown [′kau̇nt‚dau̇n]
(aerospace engineering)
The process in the engineering definition, used in leading up to the launch of a large or complicated rocket vehicle, or in leading up to a captive test, a readiness firing, a mock firing, or other firing test.
The act of counting inversely during this process.
(communications)
The ratio of the number of interrogation pulses not answered by a transponder to the total number received.
(engineering)
A step-by-step process that culminates in a climatic event, each step being performed in accordance with a schedule marked by a count in inverse numerical order.


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Since the Ontario government introduced the Countdown Acid Rain program the company has spent close to $1 billion to reduce S02 emission in its Greater Sudbury operations.
In addition to the "'Con Sabot" version, Dees markets a "hot adult contemporary" countdown that he said.
His signature solo pieces of the time, Coverage (1970), which has been part of the Alvin Ailey American Dance Theater repertoire, and Countdown (1964), have withstood the test of time.
 
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