Source : Webster's Revised Unabridged Dictionary (1913)

Mental \Men"tal\, a. [F., fr. L. mentalis, fr. mens, mentis, the
   mind; akin to E. mind. See {Mind}.]
   Of or pertaining to the mind; intellectual; as, mental
   faculties; mental operations, conditions, or exercise.

         What a mental power This eye shoots forth! --Shak.

   {Mental alienation}, insanity.

   {Mental arithmetic}, the art or practice of solving
      arithmetical problems by mental processes, unassisted by
      written figures.