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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.
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
North•um•bri•a(nɔrˈθʌm bri ə)
1. an early English kingdom extending N from the Humber to the Firth of Forth.