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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. byjus.com › free-ias-prep › zero-hourZero Hour - What is Zero Hour of Indian Parliament? - BYJU'S

    Jul 2, 2018 · Zero Hour is used by Members of Parliament (MPs) to raise issues of urgent public importance. Zero Hour starts at 12 noon immediately following the Question Hour. Read to know more about Zero Hour for IAS Exam. For UPSC 2024 preparation, follow BYJU'S.

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

    ZERO HOUR definition: 1. the time at which something, especially some type of military activity, is planned to begin 2…. Learn more.

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

    : a time when a vital decision or decisive change must be made. Synonyms. boiling point. breaking point. clutch. conjuncture. crisis. crossroad (s) crunch time. Dunkirk. emergency. exigency. extremity. flash point. head. juncture. tinderbox.

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

    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. At zero hour, it emits a sound modulated for wearer's ears only. From Bloomberg.

  6. www.oxfordlearnersdictionaries.com › definition › englishzero hour noun - Definition, pictures, pronunciation and usage...

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

  7. www.vocabulary.com › dictionary › zero hourZero hour - Definition, Meaning & Synonyms | Vocabulary.com

    Jun 22, 2024 · the time set for the start of an action or operation.

  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

    Define zero hour. zero hour synonyms, zero hour pronunciation, zero hour translation, English dictionary definition of zero hour. n. The scheduled time for the start of an operation or action, especially a combat operation of great size.

  10. www.oed.com › dictionary › zero-hour_nzero hour, n. meanings, etymology and more - Oxford English ...

    1. The time at which a military operation is scheduled to… 2. The time at which a person feels at his or her lowest. Cf… 3. The hour from which a new cycle of time is measured; spec… 1. 1915–. The time at which a military operation is scheduled to begin.

  11. www.collinsdictionary.com › us › dictionaryZERO HOUR definition in American English - Collins Online ...

    Definition of 'zero hour' Word Frequency. zero hour in American English. 1. the hour or moment at which a military attack or other important operation is to begin. 2. any crucial or decisive moment. Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved. Word Frequency.