mare clausum

[ mair-ee -klaw-suhm, mahr-ey; Latin mah-re -klou-soom ]
/ ˈmɛər i ˈklɔ səm, ˈmɑr eɪ; Latin ˈmɑ rɛ ˈklaʊ sʊm /

noun

a body of navigable water under the sole jurisdiction of a nation.

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Compare mare liberum.

Origin of mare clausum

1645–55; <Latin: closed sea
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for mare clausum

mare clausum
/ (ˈmɑːreɪ ˈklaʊsʊm) /

noun

law a sea coming under the jurisdiction of one nation and closed to all othersCompare mare liberum

Word Origin for mare clausum

Latin: closed sea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012