Gregorian calendar: Meaning and Definition of

Grego'rian cal'endar

Pronunciation: [key]
  1. the reformed Julian calendar now in use, according to which the ordinary year consists of 365 days, and a leap year of 366 days occurs in every year whose number is exactly divisible by 4 except centenary years whose numbers are not exactly divisible by 400, as 1700, 1800, and 1900. See table under
Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease.