cui bono? Syllabification: (cui bo·no?)Pronunciation: /kwē ˈbōnō/Definition of cui bono? exclamation who stands, or stood, to gain (from a crime, and so might have been responsible for it)?. Origin: early 17th century: Latin, literally 'to whom (is it) a benefit?'cui bono? in other Oxford dictionaries Definition of cui bono? in the British & World English dictionary