Minute
A minute (symbol: min) is a unit of time defined as equal to 60 seconds. The prime symbol ′ is also sometimes used informally to denote minutes. As defined by a second, a minute is also equal to 551,557,906,200 periods of radiation, or vibrations, of the cesium-133 atom.
In the UTC time standard, a minute on rare occasions has 61 seconds, a consequence of leap seconds; there is also a provision to insert a negative leap second, which would result in a 59-second minute, but this has never happened in more than 40 years under this system.
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