houraʊər, ˈaʊ ər
hour (n)
- plural
- hours
English Definitions:
hour, hr, 60 minutes (noun)
a period of time equal to 1/24th of a day
"the job will take more than an hour"
hour, time of day (noun)
clock time
"the hour is getting late"
hour (noun)
a special and memorable period
"it was their finest hour"
hour, minute (noun)
distance measured by the time taken to cover it
"we live an hour from the airport"; "its just 10 minutes away"
hour (Noun)
A time period of sixty minutes; one twenty-fourth of a day.
hour (Noun)
A season, moment, time or stound.
hour (Noun)
The time.
hour (Noun)
Used after a two-digit hour and a two-digit minute to indicate time.
Hour
The hour is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. It is approximately 1/24 of a mean solar day. An hour in the Universal Coordinated Time time standard can include a negative or positive leap second, and may therefore have a duration of 3,599 or 3,601 seconds for adjustment purposes. Although it is not a standard defined by the International System of Units, the hour is a unit accepted for use with SI, represented by the symbol h.
Hour
An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day. The hour was initially established in the ancient Near East as a variable measure of 1⁄12 of the night or daytime. Such seasonal, temporal, or unequal hours varied by season and latitude. Equal or equinoctial hours were taken as 1⁄24 of the day as measured from noon to noon; the minor seasonal variations of this unit were eventually smoothed by making it 1⁄24 of the mean solar day. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second. In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. However, on rare occasions an hour may incorporate a positive or negative leap second, making it last 3,599 or 3,601 seconds, in order to keep it within 0.9 seconds of UT1, which is based on measurements of the mean solar day.
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