WordReference Random House Unabridged Dictionary of American English © 2020
Gregorian calendar, 
  • Timethe 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  calendar. 
    • 1640–50; named after Pope Gregory XIII; see -ian

    Collins Concise English Dictionary © HarperCollins Publishers::
    Gregorian calendar n
    1. the revision of the Julian calendar introduced in 1582 by Pope Gregory XIII and still in force, whereby the ordinary year is made to consist of 365 days and a leap year occurs in every year whose number is divisible by four, except those centenary years, such as 1900, whose numbers are not divisible by 400
    'Gregorian calendar' also found in these entries:
    Advertisements
    Advertisements

    Report an inappropriate ad.