mare clausum

noun
ma·​re clau·​sum | \ˈmär-(ˌ)ā-ˈklau̇-səm, -ˈklȯ- \

Definition of mare clausum 

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

First Known Use of mare clausum

1652, in the meaning defined above

History and Etymology for mare clausum

New Latin, literally, closed sea

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The first known use of mare clausum was in 1652

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