zero hour: Meaning and Definition of

ze'ro hour"

Pronunciation: [key]
  1. the time set for the beginning of a military attack or operation.
  2. the time set for the beginning of any event or action.
  3. a decisive or critical time.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
zero gravity zero-point energy
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