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Definition of noon noun from the Oxford Advanced Learner's Dictionary

noon

noun
 
/nuːn/
 
/nuːn/
[uncountable]Idioms
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  1. 12 o’clock in the middle of the day synonym midday
    • We should be there by noon.
    • The conference opens at 12 noon on Saturday.
    • the noon deadline for the end of hostilities
    • I'm leaving on the noon train.
    see also high noonTopics Timec1
    Oxford Collocations Dictionaryadjective
    • 12
    • high
    preposition
    • around noon
    • at noon
    • by noon
    phrases
    • morning, noon and night
    See full entry
    Word OriginOld English nōn ‘the ninth hour from sunrise, i.e. approximately 3 p.m.’, from Latin nona (hora) ‘ninth hour’.
Idioms
morning, noon and night
  1. at all times of the day and night (used to emphasize that something happens very often or that it happens continuously)
    • She talks about him morning, noon and night.
    • The work continues morning, noon and night.
    • It's all she talks about, morning, noon and night.
    Topics Timec2
See noon in the Oxford Advanced American Dictionary
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