01 n. The act of besieging.
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1.
The act of besieging.[archaic]
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2.
The state of being besieged; -- used specifically of a person beset by a spirit from without.[archaic]“Whether by obsession or possession, I will not determine.” — Burton.
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3.
An excessive preoccupation of the thoughts or feelings; the persistent haunting or domination of the mind by a particular desire, idea, or image.
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4.
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
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5.
Something that causes an obsession{3}.
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6.
The state of being obsessed.