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24-hour clock

Definition of the noun 24-hour clock

What does 24-hour clock mean as a name of something?


  1. A timekeeping convention in which the 24 hours of the day are treated as one single period.


The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23. This system is the most commonly used time notation in the world today, and is used by international standard ISO 8601. In the practice of medicine, the 24-hour clock is generally used in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history. It is popularly referred to as military time in the United States, Canada, and a handful of other countries where the 12-hour clock is still dominant.

  • also known as Military time

Printed dictionaries and other books with definitions for 24-hour clock

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Google previewChildren's Illustrated Dictionary (2014)

by DK

Time-measuring devices winding stem 24-hour clock quarter past half past dial minute hand second hand hour hand timing button clock case Roman numerals pocket watch stopwatch battery seconds minutes hours gears date display ...

Google previewEncyclopedia of Time (2009)

Science, Philosophy, Theology, & Culture by H. James Birx

24-hour clock face. Although the exact origin of the astrolabe is unknown, it is thought to have developed in Greek antiquity, perhaps as early as Hipparchus but at least by the time of Ptolemy in the 2nd century CE. Although the astrolabe fell ...

Google previewRoutledge Encyclopedia of Translation Technology (2014)

by Sin-Wai Chan

24-hour clock; use of AM and PM) • number formats, digit groupings and decimal separators (period vs. comma) • paper sizes (A3, A4, legal, letter) • units of measurement (metric vs. imperial) In software engineering, these local market ...

Google previewDictionary for Air Travel and Tourism Activities: Over 7,100 Terms on Airlines (2008)

by Homero E. Martinez

Coordinated Universal Time is expressed using a 24-hour clock and uses the Gregorian calendar.

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24-Hour Clock

Royal Observatory Greenwich 24-hour clock

Photo credit: Marcin Wichary

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24-hour clock Meaning

Video shows what 24-hour clock means. A timekeeping convention in which the 24 hours of the day are treated as one single period.. 24-hour clock synonyms: ...

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