- (no longer in technical use) a psychosis characterized by thoughts confined to one idea or group of ideas.
- an inordinate or obsessive zeal for or interest in a single thing, idea, subject, or the like.
- an excessive mental preoccupation with one thing, idea, etc
n.“insanity in regard to a single subect or class of subjects,” 1820, probably on model of earlier French monomanie, from Modern Latin monomania, from Greek monos “single, alone” (see mono-) + mania (see mania). n.
- Pathological obsession with one idea or subject, as in paranoia.