proprietas

Etymology
From.

Noun

 * 1) quality, property, peculiarity, character
 * 2) the legal position of an owner particularly if his property is encumbered with a usufruct
 * 3)  property, possessions, things belonging to someone
 * 4)  office concerning the commemoration of a certain saint

Usage notes
The legal right of ownership, the absolute and principally unrestricted right over a thing, was in antiquity regularly called.