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Great Lakes

plural noun
  1. a series of five lakes between the U.S. and Canada, comprising Lakes Erie, Huron, Michigan, Ontario, and Superior; connected with the Atlantic by the St. Lawrence River.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for great lakes

Great Lakes

pl n
  1. a group of five lakes in central North America with connecting waterways: the largest group of lakes in the world: consists of Lakes Superior, Huron, Erie, and Ontario, which are divided by the border between the US and Canada and Lake Michigan, which is wholly in the US; constitutes the most important system of inland waterways in the world, discharging through the St Lawrence into the Atlantic. Total length: 3767 km (2340 miles). Area: 246 490 sq km (95 170 sq miles)
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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

great lakes in Culture

Great Lakes

Group of five large freshwater bodies in central North America. They include, west to east, Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. Except for Lake Michigan, which is entirely within the United States, the Great Lakes serve as borders between the United States and Canada.

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Note

Major shipping route through the St. Lawrence River to the Atlantic Ocean.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.