SUMMUM BONUM Meaning of SUMMUM BONUM in English summum bonum BrE AmE ˌsʌm əm ˈbəʊn əm ˌsʊm-, -ʊm-, -ˈbɒn-, -ʊm AmE \ -ˈboʊn- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012