riparian /ɹʌɪˈpɛːɹɪən/adjective 1noun 1forms 3 adjective1 •Of or relating to the bank of a river or stream.By the time she'd pulled into Bortz's subdivision, a riparian settlement in the style of Fangoso Lagoons, she was only shaking and a little nauseous in the stomach. — 1966 noun1 •A person or other entity that lives or owns property along the shore of a river. formsriparians · more riparian · most riparian