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24-hour clock

noun [S]
 
 
/twen.tiˌfɔː.raʊəˈklɒk/

Definition

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)
Focus on the pronunciation of 24-hour clock