mania

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An excessively intense enthusiasm, interest, or desire; a craze: a mania for neatness.
2. n. Psychiatry A manifestation of bipolar disorder, characterized by profuse and rapidly changing ideas, exaggerated sexuality, gaiety, or irritability, and decreased sleep.
3. n. Violent abnormal behavior. See Synonyms at insanity.

Century Dictionary and Cyclopedia

1. n. Any form or phase of insanity with exaltation of spirits and rapidity of mental action; specifically, a psychoneurosis with these as the fundamental features. In a mania in this strict sense there may be delusions, but they fail of the systematized character of those of paranœa. Delusions and hallucinations may also be present. The attack may last for days, or months, or years. The prognosis is not very unfavorable. The cases issue in recovery, in death by exhaustion and intercurrent disease, and a considerable proportion in permanent imbecility.
2. n. An eager, uncontrolled, or uncontrollable desire: as, a mania for drink; in colloquial use, a “rage” or craze for something: as, a mania for first editions.

Wiktionary

1. n. Violent derangement of mind; madness; insanity.
2. n. Excessive or unreasonable desire; insane passion affecting one or many people; fanaticism.

GNU Webster's 1913

1. n. Violent derangement of mind; madness; insanity. Cf. delirium.
2. n. Excessive or unreasonable desire; insane passion affecting one or many people.

WordNet 3.0

1. n. a mood disorder; an affective disorder in which the victim tends to respond excessively and sometimes violently
2. n. an irrational but irresistible motive for a belief or action