n.
- 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.
To enter in a calendar; schedule.
[Middle English calender, from Old French calendier, from Late Latin kalendārium, from Latin, account book, from kalendae, calends (from the fact that monthly interest was due on the calends).]
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 |
| Elul | (Aug-Sep) | 29 | ||||
Copyright � 2000 by Houghton Mifflin Company
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
