NorthumbriaPronunciation: /nɔːˈθʌmbrɪə/Definition of Northumbria an area of NE England comprising Northumberland, Durham, and Tyne and Wear. an ancient Anglo-Saxon kingdom in NE England extending from the Humber to the Forth. Derivatives Northumbrian adjective & noun Origin:from obsolete Northumber, denoting a person living beyond the HumberNorthumbria in other Oxford dictionaries Definition of Northumbria in the US English dictionary
