Stephensonian adjective 2noun 1forms 3 adjective2 •Of or relating to George Stephenson (1781–1848), English engineer who built the first public intercity railway line to use steam locomotives. •Of or relating to Neal Stephenson (born 1959), American writer of speculative fiction and cyberpunk novels. noun1 •(informal) A member or alumnus of Stephenson College, Durham. formsStephensonians · more Stephensonian · most Stephensonian