Noun
Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement.
Source: Webster's dictionaryA recurrent source of conflict on Gamma World is the rivalry among the "Cryptic Alliances", semi-secret societies whose ideological agendas—usually verging on monomania —often bring them into conflict with the rest of the Gamma World. Source: Internet
Second, Ahab's response to the sequence of meetings shows the "rising curve of his passion" so that the meetings form a diagram of the climactic development of his monomania. Source: Internet