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1. A policy of imperialistic expansion defended as necessary or benevolent.
2. often Manifest Destiny The 19th-century doctrine that the United States had the right and duty to expand throughout the North American continent.
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.
(Historical Terms) (esp in the 19th-century US) the belief that the US was a chosen land that had been allotted the entire North American continent by God
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the 19th-century belief that it was inevitable for the U.S. to expand to the Pacific coast.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.