res nullius

noun
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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History and Etymology for res nullius

Late Latin, literally, thing of no one

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