TRILINGUAL Meaning of TRILINGUAL in English tri ‧ lin ‧ gual /ˌtraɪˈlɪŋɡwəl◂/ BrE AmE adjective 1 . able to speak three languages 2 . using three languages:a trilingual medieval inscription Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012