Obsession
Pronunciation : Ob*ses"sion
Part of Speech : n.
Etymology : [L. obsessio: cf.F. obsession.]
Definition : 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