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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.

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    More definitions, origin and scrabble points

  2. dictionary.cambridge.org › dictionary › englishZERO HOUR | English meaning - Cambridge Dictionary

    noun [ U ] uk/ˈzɪə.rəʊ ˌaʊər/us/ˈzɪr.oʊ ˌaʊr/ Add to word listAdd to word list. the time at which something, especially some type of military activity, is planned to begin. Indian English. in the Indian parliament, the time during which members of parliament can ask questions without arranging to ask them first.

    • Translate to Mandarin Chinese

      ZERO HOUR translate: 行动开始时间；（尤指军事行动的）发动时刻, （印度议会的）自由问答时间....

    • Zero-Hours Contract

      ZERO-HOURS CONTRACT definition: 1. an agreement under which...

    • Zero Defects

      ZERO DEFECTS definition: a system that tries to make certain...

  3. www.merriam-webster.com › dictionary › zero hourZero hour Definition & Meaning - Merriam-Webster

    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.

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  5. dictionary.cambridge.org › us › dictionaryZERO HOUR | definition in the Cambridge English Dictionary

    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.

  6. www.collinsdictionary.com › dictionary › englishZERO HOUR definition and meaning | Collins English Dictionary

    zero hour in British English. noun. 1. military. the time set for the start of an attack or the initial stage of an operation. 2. informal. a critical time, esp at the commencement of an action. Collins English Dictionary.

  7. www.oxfordlearnersdictionaries.com › english › zero-hourzero hour - Oxford Learner's Dictionaries

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

  8. www.dictionary.com › browse › zero-hourZERO HOUR Definition & Meaning | Dictionary.com

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

  9. www.thefreedictionary.com › zero+hourZero hour - definition of zero hour by The Free Dictionary

    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.