trifecta Syllabification: (tri·fect·a)Pronunciation: /trīˈfektə/Definition of trifecta noun a bet in which the person betting forecasts the first three finishers in a race in the correct order. [in singular] a run of three wins or grand events:today is a trifecta of birthdaysOrigin: 1970s: from tri- 'three' + perfectatrifecta in other Oxford dictionaries Definition of trifecta in the British & World English dictionary