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An Anglian kingdom of northern England formed in the seventh century by the union of Bernicia and Deira. Much of Northumbria fell to invading Danes in the ninth century and was annexed to Wessex in 954.
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.
1. (Historical Terms) (in Anglo-Saxon Britain) a region that stretched from the Humber to the Firth of Forth: formed in the 7th century ad, it became an important intellectual centre; a separate kingdom until 876 ad
2. (Placename) an area of NE England roughly corresponding to the Anglo-Saxon region of Northumbria
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
North•um•bri•a(nɔrˈθʌm bri ə)
1. an early English kingdom extending N from the Humber to the Firth of Forth.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.