ma·ni·a 
(mānē-ə, mānyə)
(mānē-ə, mānyə)n.
1. An excessively intense enthusiasm, interest, or desire: a mania for neatness; a dance mania.
2. Psychiatry An abnormal psychological state characterized by symptoms such as elation, high energy and activity level, racing thoughts, irritability, and rapid speech, typically occurring in people with bipolar disorder.
[Middle English, madness, from Late Latin, from Greek maniā; see men-1 in the Appendix of Indo-European roots.]