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English definition of “24-hour clock”

24-hour clock

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