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Definition of Quadfecta
1. Noun. (gambling horse racing) A bet in which the bettor must select the winners of the first four places (i.e., first, second, third, and fourth) of a race in the correct order. ¹
2. Noun. (context: by extension) A set of four wins at related events; a set of four events. ¹
¹ Source: wiktionary.com