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  1. Dictionary
    zero hour
    /ˈzɪərəʊ ˌaʊə/

    noun

    • 1. the time at which a planned operation, typically a military one, is set to begin.

    More definitions, origin and scrabble points

  2. Describing when something happened or will happen. (Definition of zero hour from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) Examples of zero hour. zero hour. Whoever was responsible managed to send that ship up the river almost exactly at zero hour. From the.

  3. Zero hour is the hour at which a planned military operation or a significant event starts, or a time of crisis or decision. Learn the synonyms, examples, and word history of zero hour from Merriam-Webster dictionary.

  4. Zero hour is the time at which something, especially some type of military activity, is planned to begin. Learn more about the meaning, usage and origin of this term with examples from various sources.

  5. noun. 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. Most material © 2005, 1997, 1991 by Penguin Random House LLC. Modified entries © 2019 by Penguin Random House LLC and HarperCollins Publishers Ltd. Word origin. [ 1915–20]

  6. Definition of zero hour noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  7. Zero hour definition: the time set for the beginning of a military attack or operation.. See examples of ZERO HOUR used in a sentence.

  8. Zero hour is the time set for the start of an attack or operation, especially a military one. It can also mean a critical or decisive time in any action. See synonyms, translations and usage examples.