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Gregorian calendar

a corrected form of the Julian calendar, introduced by Pope Gregory XIII in 1582 and now used in most countries of the world: it provides for an ordinary year of 365 days and a leap year of 366 days every fourth, even year, exclusive of the final year of a century, which is a leap year only if exactly divisible by 400

See Gregorian calendar in American Heritage Dictionary 4

noun
The solar calendar in use throughout most of the world, sponsored by Pope Gregory XIII in 1582 as a corrected version of the Julian calendar. See Table at calendar.
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