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Definition of 24-hour clock noun from the Oxford Advanced Learner's Dictionary

24-hour clock

noun
 
/ˌtwenti fɔːr aʊə ˈklɒk/
 
/ˌtwenti fɔːr aʊər ˈklɑːk/
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  1. the system of using twenty-four numbers to talk about the hours of the day, instead of dividing it into two units of twelve hoursTopics Timec1
See 24-hour clock in the Oxford Advanced American Dictionary
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noun
 
 
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