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English definition of “24-hour clock”

24-hour clock

noun [S]     MEASURES
the system of using 24 numbers instead of 12 to refer to the hours in the day : Does the video use a 12- or 24-hour clock ? The meeting is at 4.30, or 16.30 for those using the 24-hour clock system .
(Definition of 24-hour clock noun from the Cambridge Business English Dictionary © Cambridge University Press)
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