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twelve-hour clock
or 12-hour clock
[ twelv-ouuhr klok, ou-er ]
noun
- a system of time measurement in which the day is divided into two twelve-hour periods, both midnight and noon are 12:00, and the hours following each are numbered from 1:00 to 11:00 a.m. or p.m. Compare twenty-four-hour clock ( def ).
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Word History and Origins
Origin of twelve-hour clock1
First recorded in 1870–80
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