Definitions for zero hour

This page provides all possible meanings and translations of the word zero hour

Random House Webster's College Dictionary

ze′ro hour`(n.)

  1. the time set for the beginning of a military attack or operation.

    Category: Common Vocabulary, Military

  2. the time set for the beginning of any event or action.

    Category: Common Vocabulary

  3. a decisive or critical time.

    Category: Common Vocabulary

Origin of zero hour:

1915–20

Princeton's WordNet

  1. zero hour(noun)

    the time set for the start of an action or operation

Wiktionary

  1. zero hour(Noun)

    The scheduled time for the start of some event, especially a military operation; H-hour

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