A possessive pronoun that is reflexive; i.e. one that refers back to the subject

Dated form of possession is nine-tenths of the law.

One who has possession of a thing has some right to it; a popular statement of the doctrine of adverse possession.

(law, England & Wales, formal, idiomatic) The unqualified and unrestricted ownership of an estate in land; freehold tenure.

Maroon Spirit

(grammar) Verb complement in some languages or some constructions of a given language; the noun which is possessed. / The subject of a possession by a demon or spirit.

The quality of being possessed.

In a self-possessed manner.

So as to be possessed.

(archaic) Third-person singular simple present indicative form of possess