ZERO HOUR


Meaning of ZERO HOUR in English

transcription, транскрипция: [ noun ]

Etymology: from its being marked by the count of zero in a countdown

Date: 1917

1.

a. : the hour at which a planned military operation is scheduled to start

b. : the time at which a usually significant or notable event is scheduled to take place

2. : a time when a vital decision or decisive change must be made

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.