First Known Use: 1921
Dictionary
mare nostrum
noun ma·re no·strum \ˈmär-(ˌ)ā-ˈnōs-trəm\
Definition of MARE NOSTRUM
: a navigable body of water (as a sea) that belongs to a single nation or is mutually shared by two or more nations
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Origin of MARE NOSTRUM
New Latin, literally, our sea
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