Usually means: Critical moment of decisive action.
Definitions Related words Mentions
We found 19 dictionaries that define the word zero hour:

General (19 matching dictionaries)
  1. zero hour: Longman Dictionary of Contemporary English
  2. zero hour: Merriam-Webster
  3. zero hour: Oxford Learner's Dictionaries
  4. zero hour: American Heritage Dictionary of the English Language
  5. zero hour: Collins English Dictionary
  6. zero hour: Vocabulary.com
  7. zero-hour: Wordnik
  8. zero hour: Cambridge Advanced Learner's Dictionary
  9. zero hour: Wiktionary
  10. zero hour: The Wordsmyth English Dictionary-Thesaurus
  11. zero hour: Infoplease Dictionary
  12. zero hour: Dictionary.com
  13. The Zero Hour (Japanese radio series), The Zero Hour (U.S. radio series), The Zero Hour (World War II), Zero Hour (Cussler novel), Zero Hour (Eidolon album), Zero Hour (Stargate SG-1), Zero Hour (band), Zero Hour (comics), Zero Hour (disambiguation), Zero Hour (military designation), Zero Hour (play), Zero Hour, Zero Hour, Zero hour: Wikipedia, the Free Encyclopedia
  14. zero hour: Rhymezone
  15. zero hour: FreeDictionary.org
  16. zero hour: Mnemonic Dictionary
  17. zero hour: TheFreeDictionary.com

(Note: See zero_hours as well.)

Definitions from Wiktionary (zero hour)

noun:  Synonym of H-hour.

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