trilingualPronunciation: /trʌɪˈlɪŋgw(ə)l/Translate trilingual | into German Definition of trilingual adjective speaking three languages fluently. (of a text or an activity) written or conducted in three languages:CNN have begun offering a trilingual entertainment serviceDerivatives trilingualism noun Origin: mid 19th century: from tri- 'three' + Latin lingua 'tongue' + -altrilingual in other Oxford dictionaries Definition of trilingual in the US English dictionary