Source : Webster's Revised Unabridged Dictionary (1913)

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}.