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

 

24-hour clock

 noun
noun
BrE BrE//ˌtwenti fɔːr aʊə ˈklɒk//
 
; NAmE NAmE//ˌtwenti fɔːr aʊər ˈklɑːk//
 
 
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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 American Dictionary entry: 24-hour clock