zero hour

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Definitions from WordNet

Noun zero hour has 1 sense

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:

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

Sample Sentences:

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

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