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Definition of 24-hour clock noun from the Oxford Advanced American Dictionary

 

24-hour clock

 noun
noun
NAmE//ˌtwɛnti fɔr ˌaʊər ˈklɑk//
 
 
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the system of using twenty-four numbers to talk about the hours of the day, instead of dividing it into two units of twelve hours
See the Oxford Advanced Learner's Dictionary entry: 24-hour clock