Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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calendar year the period of time that begins on January 1 and ends on December 31. (Cf. fiscal year.)
Gregorian calendar the calendar introduced by Gregory XIII in 1582, succeeding the Julian calendar, and presently in use in most of the world.
Hebrew calendar see Jewish calendar.
Jewish calendar a lunisolar calendar that is used by the Jews to calculate holidays, is reckoned from 3761 B.C., and has twelve months in most years and another month added about every three years.
Julian calendar the calendar introduced by Julius Caesar in 46 B.C., in which the year had 365 days and twelve months. (See Gregorian calendar.)
Roman calendar the lunar calendar used in ancient Rome prior to the adoption of the Julian calendar.