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A calendar is the order that divides a year into days, weeks and months. (noun)

An example of a calendar is the Mayan calendar.

A calendar is a printed or electronic version of a standard division of a year into months, weeks, and days. (noun)

An example of a calendar is a 12-month 2012 calendar with cats on it.

Calendar describes any person or thing that is on a printed schedule of the year. (adjective)

An example of calendar used as an adjective is a calendar girl.

To calendar is to schedule things. (verb)

An example of to calendar is to meet with coworkers to schedule a project’s major deadlines.

See calendar in Webster's New World College Dictionary

noun

a system of determining the beginning, length, and divisions of a year and for arranging the year into days, weeks, and months
a table, chart, register, etc. that shows such an arrangement, usually for a single year
a list or schedule, as of pending court cases, bills coming before a legislature, planned social events, etc.

adjective

such as that appearing on certain popular, conventional calendars: calendar art, a calendar girl

transitive verb

to enter in a calendar; specif., to schedule

Related Forms:

calendrical adjective or calendric

See calendar in American Heritage Dictionary 4

(kălˈən-dər)

noun

Any of various systems of reckoning time in which the beginning, length, and divisions of a year are defined.
A table showing the months, weeks, and days in at least one specific year.
A schedule of events.
An ordered list of matters to be considered: a calendar of court cases; the bills on a legislative calendar.
Chiefly British A catalog of a university.

transitive verb cal·en·dared, cal·en·dar·ing, cal·en·dars

To enter in a calendar; schedule.

Three Principal Calendars

The Gregorian calendar is now in use as the civil calendar throughout most of the world. The Jewish calendar is the official calendar of the Jewish religious community. The Islamic calendar is the official calendar in many Muslim countries. Each calendar listed below begins with the first month of the year and includes the number of days each month contains. Many months have a variable number of days, as described below.

GREGORIAN		JEWISH			ISLAMIC
Months	Number of Days	Months		Number of Days	Months	Number of Days
January	31	Tishri	(Sep-Oct)	30	Muharram	29 or 30
February	28 or 29	Heshvan	(Oct-Nov)	29 or 30	Safar	29 or 30
March	31	Kislev	(Nov-Dec)	29 or 30	Rabi I	29 or 30
April	30	Tevet	(Dec-Jan)	30	Rabi II	29 or 30
May	31	Shevat	(Jan-Feb)	30	Jumada I	29 or 30
June	30	Adar	(Feb-Mar)	29 or 30	Jumada II	29 or 30
July	31	Adar Sheni	(leap year only)	29	Rajab	29 or 30
August	31	Nisan	(Mar-Apr)	30	Shaעban	29 or 30
September	30	Iyar	(Apr-May)	29	Ramadan	29 or 30
October	31	Sivan	(May-Jun)	30	Shawwal	29 or 30
November	30	Tammuz	(Jun-Jul)	29	Dhuאl-Qaעdah	29 or 30
December	31	Av	(Jul-Aug)	30	Dhuאl-Hijjah	29 or 30
December	31	Elul	(Aug-Sep)	29