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The outer limit of the area extending three miles out to sea from the coast of a country or state, traditionally considered to constitute the country or state's territorial waters.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Law) international law the range of a nation's territorial waters, extending to three nautical miles from shore
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the outer limit of a three-mile belt of waters adjacent to a coast, regarded as under the jurisdiction of the state possessing the coast.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.