NOUN (3)

1. a system of timekeeping that defines the beginning and length and divisions of the year;

2. a list or register of events (appointments or social events or court cases etc);
- Example: "I have you on my calendar for next Monday"

3. a tabular array of the days (usually for one year);


VERB (1)

1. enter into a calendar;

The Collaborative International Dictionary of English v.0.48:

Calendar \Cal"en*dar\, n. [OE. kalender, calender, fr. L.
   kalendarium an interest or account book (cf. F. calendrier,
   OF. calendier) fr. L. calendue, kalendae, calends. See
   Calends.]
   1. An orderly arrangement of the division of time, adapted to
      the purposes of civil life, as years, months, weeks, and
      days; also, a register of the year with its divisions; an
      almanac.
      [1913 Webster]

   2. (Eccl.) A tabular statement of the dates of feasts,
      offices, saints' days, etc., esp. of those which are
      liable to change yearly according to the varying date of
      Easter.
      [1913 Webster]

   3. An orderly list or enumeration of persons, things, or
      events; a schedule; as, a calendar of state papers; a
      calendar of bills presented in a legislative assembly; a
      calendar of causes arranged for trial in court; a calendar
      of a college or an academy.
      [1913 Webster]

   Note: Shepherds of people had need know the calendars of
         tempests of state. --Bacon.
         [1913 Webster]

   Calendar clock, one that shows the days of the week and
      month.

   Calendar month. See under Month.

   French Republican calendar. See under Vend['e]miaire.

   Gregorian calendar, Julian calendar, Perpetual
   calendar. See under Gregorian, Julian, and Perpetual.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Calendar \Cal"en*dar\, v. t. [imp. & p. p. Calendared; p. pr.
   & vb. n. Calendaring.]
   To enter or write in a calendar; to register. --Waterhouse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calendar
    n 1: a system of timekeeping that defines the beginning and
         length and divisions of the year
    2: a list or register of events (appointments or social events
       or court cases etc); "I have you on my calendar for next
       Monday"
    3: a tabular array of the days (usually for one year)
    v 1: enter into a calendar

Moby Thesaurus II by Grady Ward, 1.0:

206 Moby Thesaurus words for "calendar":
   Chinese calendar, Cotsworth calendar, Domesday Book,
   Gregorian calendar, Hindu calendar, Jewish calendar,
   Julian calendar, Muslim calendar, Revolutionary calendar,
   Roman calendar, account book, address book, adversaria, agenda,
   album, almanac, annals, annual, appointment calendar,
   appointment schedule, astronomical almanac, astronomical calendar,
   atlas, batting order, beadroll, bill, bill of fare, blankbook,
   blotter, blueprint, book, budget, cadastre, calendar stone,
   calends, card, carte du jour, carve, casebook, cashbook, catalog,
   catalogue raisonne, census, census report, chalk, chalk up,
   check in, checklist, checkroll, chronicle, chronogram,
   chronologize, chronology, church calendar, city directory,
   classified catalog, clause, commonplace book,
   companion bills amendment, concordance, court calendar, cut,
   cyclopedia, daybook, desk calendar, diary, diatesseron,
   dictionary catalog, diptych, directory, docket, dragnet clause,
   dramatis personae, ecclesiastical calendar, enacting clause,
   encyclopedia, engagement book, engrave, enroll, enscroll, enter,
   enumerate, ephemeris, escalator clause, file, fill out, gazetteer,
   grave, harmony, head count, hold-up bill, honor roll, impanel,
   incise, index, inscribe, insert, intercalate, inventory, itemize,
   joker, jot down, journal, jury list, jury panel, keep score,
   ledger, line up, lineup, list, list of agenda, log, logbook,
   loose-leaf notebook, make a memorandum, make a note, make an entry,
   make out, mark down, matriculate, memo book, memorandum book,
   memory book, menu, minute, motion, muster, muster roll, nose count,
   note, note down, notebook, omnibus bill, order of business, pad,
   perpetual calendar, petty cashbook, phone book, pigeonhole,
   place upon record, playbill, pocket notebook, pocketbook,
   police blotter, poll, polyglot, post, post up, privileged question,
   program, program of operation, programma, property roll,
   prospectus, protocol, proviso, put down, put in writing,
   put on paper, put on tape, question, questionnaire, record,
   record book, reduce to writing, reference book, register, returns,
   rider, roll, roll call, roster, rota, saving clause, schedule,
   score, scrapbook, scratch pad, scroll, set down, slate,
   source book, spiral notebook, studbook, table, tablet, tabulate,
   take down, tally, tape, tape-record, tax roll, telephone book,
   telephone directory, timetable, triptych, videotape,
   work of reference, workbook, write, write down, write in,
   write out, write up, writing tablet, yearbook