PROLONGATION Meaning of PROLONGATION in English prolongation BrE AmE ˌprəʊ lɒŋ ˈɡeɪʃ ə n AmE \ ˌproʊ lɔːŋ- -lɑːŋ-; prəˌ•ˈ•• ▷ prolongation|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012