Home › Words › L › londonianlondonian/lʌnˈdəʊnɪ.ən/londonian · adj — of or relating to the city of London, England.Definition from Wiktionary (CC BY-SA 3.0).londonian is pronounced /lʌnˈdəʊnɪ.ən/.EtymologyIn the city sense, perhaps from French Londonien, londonien.adjOf or relating to the city of London, England.Of or relating to Jack London (1876–1916), American author, journalist, and social activist.nounA Londoner.Definitions & examples from Wiktionary (CC BY-SA 3.0).