mare clausum mare • mare liberum · · · Info · Definitions · Characters · · mare clausum · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) (closed sea) a navigable body of water under the jurisdiction of a single nation. Synonyms: mare clausum. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075