res nul·li·us
| \ ˌrāsnəˈlēəs, rāˈsnu̇lē-; ˌrēznəˈlīəs, rēzˈnəlēəs \
Definition of res nullius
1
: a thing belonging to no one whether because never appropriated (as a wild animal) or because abandoned by its owner but acquirable by appropriation
2
: property not subject to private ownership under Roman law
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Merriam-Webster unabridged
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