riparianPronunciation: /rʌɪˈpɛːrɪən/Definition of riparian adjective chiefly Law relating to or situated on the banks of a river:all the riparian states must sign an agreement Ecology relating to wetlands adjacent to rivers and streams: the ranch’s most expansive riparian habitatOrigin: mid 19th century: from Latin riparius (from ripa 'bank') + -anriparian in other Oxford dictionaries Definition of riparian in the US English dictionary