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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

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

    noun. Synonyms of zero hour. 1. a. : the hour at which a planned military operation is scheduled to start. b. : the time at which a usually significant or notable event is scheduled to take place. 2. : a time when a vital decision or decisive change must be made. Synonyms. boiling point. breaking point. clutch. conjuncture. crisis. crossroad (s)

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

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

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

    noun. /ˈzɪərəʊ aʊə (r)/ /ˈzɪrəʊ aʊər/ [uncountable] the time when an important event, an attack, etc. is planned to start. It’s five minutes to zero hour. Take your English to the next level. The Oxford Learner’s Thesaurus explains the difference between groups of similar words.

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

    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]

  7. 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.

  8. 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.

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

    6 days ago · the time set for the start of an action or operation.

  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.yourdictionary.com › zero-hourZero Hour Definition & Meaning | YourDictionary

    Zero Hour definition: The scheduled time for the start of an operation or action, especially a combat operation of great size.