Noun
Initialism of hour-minute-second: A format for writing decimal angles.
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36.24° = 36° 14' 24"
Initialism of hour-minute-second: A 24 or 12-hour time format that includes seconds, in addition to hours and minutes.
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14:37:12 = 14:37 (2:37 pm) and 12 seconds
Initialism of hour-minute-second: A format for writing decimal time, usually associated with base-10 time such as during the French Revolution.
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7.4138 base-10 decimal hours = 7ʰ 41ᵐ 38ˢ