OBSESSION
obsession, fixation
(noun) an unhealthy and compulsive preoccupation with something or someone
compulsion, obsession
(noun) an irrational motive for performing trivial or repetitive actions, even against your will; “her compulsion to wash her hands repeatedly”
Source: WordNet® 3.1
Etymology
Noun
obsession (countable and uncountable, plural obsessions)
A compulsive or irrational preoccupation.
An unhealthy fixation.
Influence or control by evil spirits without possession.
Anagrams
• bosonises
Source: Wiktionary
Ob*ses"sion, n. Etym: [L. obsessio: cf.F. obsession.]
1. The act of besieging. Johnson.
2. The state of being besieged; -- used specifically of a person
beset by a spirit from without. Tylor.
Whether by obsession or possession, I will not determine. Burton.
Source: Webster’s Unabridged Dictionary 1913 Edition