First Known Use: 1652
Dictionary
mare liberum
noun ma·re li·be·rum \ˈmär-(ˌ)ā-ˈlē-bə-ˌru̇m\
Definition of MARE LIBERUM
1
: a navigable body of water (as a sea) that is open to all nations
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Origin of MARE LIBERUM
New Latin, literally, free sea
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