A legal term meaning sole (of and individual or group) ownership and control over something. Persons not in ownership my not of access to said thing or if they do, they do not have say in they use or control of it said thing.

“Like most of the criticisms of the enclosure movement, the poem depicts a world of rapacious, state-aided “privatization,” a conversion into private property of something that had formerly been common property or, perhaps, had been outside of the property system altogether”

James Boyles, The Second Enclosure Movment and the Construction of the Public Domain