Stephenson, George Syllabification: (Ste·phen·son, George)Pronunciation: /ˈstēvənsən/Definition of Stephenson, George (1781–1848), British engineer; a pioneer of steam locomotives and railroads. With his son Robert (1803–59) he built the Rocket (1829), the prototype for all future steam locomotives. Stephenson, George in other Oxford dictionaries Definition of Stephenson, George in the British & World English dictionary