mare liberum

noun
ma·​re li·​be·​rum | \ˈmär-(ˌ)ā-ˈlē-bə-ˌru̇m \

Definition of mare liberum 

1 : a navigable body of water (such as a sea) that is open to all nations

First Known Use of mare liberum

1652, in the meaning defined at sense 1

History and Etymology for mare liberum

New Latin, literally, free sea

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The first known use of mare liberum was in 1652

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