i Register
In some senses, stephensonian is marked as informal. Watch for register when choosing this word.
adj
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.
noun
A member or alumnus of Stephenson College, Durham.