trifectaPronunciation: /trʌɪˈfɛktə/Definition of trifecta noun North American & Australian/NZ 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:he will attempt a trifecta of the long jump, triple jump, and 110-meter high hurdlesOrigin: 1970s: from tri- 'three' + perfectatrifecta in other Oxford dictionaries Definition of trifecta in the US English dictionary