Klingon Syllabification: (Kling·on)Pronunciation: /ˈkliNGˌän/Definition of Klingon noun 1a member of a warlike humanoid alien species in the television series Star Trek and its derivatives and sequels. 2the language of the Klingons:the site is also available in synthetic languages like Esperanto and KlingonOrigin: 1960s: invented nameKlingon in other Oxford dictionaries Definition of Klingon in the British & World English dictionary