Jisho

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うるうびょう 閏秒
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Noun
1. leap second​
Wikipedia definition
2. Leap second​A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time. The UTC time standard, which is widely used for international timekeeping and as the reference for civil time in most countries, uses the international system (SI) definition of the second, based on atomic clocks. Like most time standards, UTC defines a grouping of seconds into minutes, hours, days, months, and years.
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Read “Leap second” on DBpedia
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うるう秒 【うるうびょう】

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