资料来源 : Webster's Revised Unabridged Dictionary (1913)

Perpetual calendar \Per*pet"u*al cal"en*dar\
   A calendar that can be used perpetually or over a wide range
   of years. That of Capt. Herschel covers, as given below,
   dates from 1750 to 1961 only, but is capable of indefinite
   extension.

Perpetual \Per*pet"u*al\, a. [OE. perpetuel, F. perp['e]tuel,
   fr. L. perpetualis, fr. perpetuus continuing throughout,
   continuous, fr. perpes, -etis, lasting throughout.]
   Neverceasing; continuing forever or for an unlimited time;
   unfailing; everlasting; continuous.

         Unto the kingdom of perpetual night.     --Shak.

         Perpetual feast of nectared sweets.      --Milton.

   {Circle of perpetual apparition}, or {occultation}. See under
      {Circle}.

   {Perpetual calendar}, a calendar so devised that it may be
      adjusted for any month or year.

   {Perpetual curacy} (Ch. of Eng.), a curacy in which all the
      tithes are appropriated, and no vicarage is endowed.
      --Blackstone.

   {Perpetual motion}. See under {Motion}.

   {Perpetual screw}. See {Endless screw}, under {Screw}.

   Syn: Continual; unceasing; endless; everlasting; incessant;
        constant; eternal. See {Constant}.

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.

   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.

   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.

   Note: Shepherds of people had need know the calendars of
         tempests of state. --Bacon.

   {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}.

资料来源 : WordNet®

perpetual calendar
     n : a chart or mechanical device that indicates the days of the
         week corresponding to any given date over a long period
         of years