the Canadian provinces bordering the Atlantic Ocean, comprising New Brunswick, Newfoundland, Nova Scotia, and Prince Edward Island.
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British Dictionary definitions for Atlantic Provinces
the Atlantic Provinces certain of the Canadian provinces with coasts facing the Gulf of St Lawrence or the Atlantic: New Brunswick, Nova Scotia, Prince Edward Island, and Newfoundland and Labrador
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