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zero hour
 

Definitions from WordNet

Noun zero hour has 1 sense
  1. zero hour - the time set for the start of an action or operation
    --1 is a kind of     hour, time of day

Definitions from the Web

Zero Hour

Part of Speech: Noun

Sense: The scheduled time for the start of an event or operation.

Usage:

  1. Popular: In military terminology, zero hour refers to the exact time when a military operation is planned to commence.
  2. Local: In everyday usage, zero hour can also refer to the beginning or starting point of any significant event or activity.

Sample Sentences:

  1. The soldiers prepared themselves for the fierce battle on zero hour at dawn.
  2. The launch of the new product is set for zero hour tomorrow morning.

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