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Definition of mania : 1. Excessive or unreasonable desire; insane passion affecting one or many people; as, the tulip mania.
2. Violent derangement of mind; madness; insanity. Cf. Delirium.

Synonyms:

love, monomania, fixation, desire, warmth, study at hysteria, alienation, manic disorder, passion, disturbance, unbalance, concern, rage, brainsickness, craze, obsession, psychopathy, passionateness, enthusiasm, thing, insaneness, mental illness, sane, fetish, aberration, cacoethes, heat

derangement, craziness, insanity, hysteria, delirium, brain-sickness, lunacy, hallucination, madness, neurosis, nuttiness, psychosis, dementia, frenzy, feverishness, battiness, kookiness

Usage examples:

• I never fancied you bitten by the political mania." - "Ernest Maltravers, Complete", Edward Bulwer-Lytton.
• It is possible, however, to prevent the 'book- buying disease' from developing into a general collector's mania. - "The Great Book-Collectors", Charles Isaac Elton and Mary Augusta Elton.
• She must have a mania, there's no other explanation for it; but we're going to keep it all quiet. - "'Laramie;' or, The Queen of Bedlam.", Charles King.