interurban adjective 1noun 1forms 1 adjective1 •Of, pertaining to, involving or joining two or more urban centres. noun1 •(US) An electric railway carrying mainly passengers between two or more urban centres.Q. Took the interurban at Denison? A. Yes, sir. Q. And went from there to McKinney on the interurban? — 1916 formsinterurbans