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English definition of “24-hour clock”

24-hour clock

noun [S] uk   /twen.tiˌfɔː.raʊəˈklɒk/ us  
the system of using 24 numbers instead of twelve to refer to the hours in the dayWatches and clocks
(Definition of 24-hour clock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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