[mair-ee lib-er-uh m, mahr-ey; Latin mah-re lee-be-roo m]
a body of navigable water to which all nations have unrestricted access.
Compare mare clausum.
Origin of mare liberum
1645–55; < Latin: free sea
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for mare liberum
Latin: free 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