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The Collaborative International Dictionary of English v.0.48 (gcide)

Obsession \Ob*ses"sion\, n. [L. obsessio: cf. F. obsession.]
1. The act of besieging. [archaic] --Johnson.
[1913 Webster]

2. The state of being besieged; -- used specifically of a
person beset by a spirit from without. [archaic] --Tylor.
[1913 Webster]

Whether by obsession or possession, I will not
determine. --Burton.
[1913 Webster]

3. An excessive preoccupation of the thoughts or feelings;
the persistent haunting or domination of the mind by a
particular desire, idea, or image.
[PJC]

4. Hence: Any driving motive; a compelling goal; -- not
necessarily implying a negative judgment, as does sense 3;
as, the coach was obsessed with winning the state
championship
[PJC]

5. Something that causes an obsession[3].
[PJC]

6. The state of being obsessed.
[PJC] obsessional