Source : Webster's Revised Unabridged Dictionary (1913)

Mania \Ma"ni*a\, n. [L. mania, Gr. ?, fr. ? to rage; cf. OE.
   manie, F. manie. Cf. {Mind}, n., Necromancy.]
   1. Violent derangement of mind; madness; insanity. Cf.
      {Delirium}.

   2. Excessive or unreasonable desire; insane passion affecting
      one or many people; as, the tulip mania.

   {Mania a potu} [L.], madness from drinking; delirium tremens.

   Syn: Insanity; derangement; madness; lunacy; alienation;
        aberration; delirium; frenzy. See {Insanity}.

Source : WordNet®

mania
     n 1: an irrational but irresistible motive for a belief or action
          [syn: {passion}, {cacoethes}]
     2: a mood disorder; an affective disorder in which the victim
        tends to respond excessively and sometimes violently [syn:
         {manic disorder}]