Monomania
Part of speech: noun
Definition: Excessive interest or concentration on a singular object or subject. A pathological obsession with one person, thing or idea.
Possession
Part of speech: noun
Definition: Ownership.Something that is owned.A territory under the rule of another country.The condition or affliction of being possessed by a demon or other supernatural entity.Control of the ball; the opportunity to be on the offensive.
Example sentence: The man who acquires the ability to take full possession of his own mind may take possession of anything else to which he is justly entitled.