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GREGO'RIAN, adjective Denoting what belongs to Gregory. The gregorian calendar, is one which shows the new and full moon, with the time of Easter, and the movable feasts depending thereon, by means of epacts. The gregorian year, is the present year, as reformed by pope Gregory XIII, in 1582; consisting of 365 days, 5 hours, 48 minutes, 47 seconds, with an additional day every fourth year.