Adjective
Of or pertaining to possession, either as a fact or a right; of the nature of possession; as, a possessory interest; a possessory lord.
Source: Webster's dictionaryThe 1822 Statute of Administration of Non-Russians in Siberia asserted state ownership over all the land in Siberia and then "granted" possessory rights to the natives. Source: Internet
The Restatement (First) of Property defines property as anything, tangible or intangible whereby a legal relationship between persons and the state enforces a possessory interest or legal title in that thing. Source: Internet