mare clausum


ma·re clau·sum

noun \ˈmär-(ˌ)ā-ˈkla-səm, -ˈkl-\

Definition of MARE CLAUSUM

:  a navigable body of water (as a sea) that is under the jurisdiction of one nation and is closed to other nations

Origin of MARE CLAUSUM

New Latin, literally, closed sea
First Known Use: 1652

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