Definition of "trifecta"

The conservative player will play the exacta box bet and the occasional trifecta box wager.

2006, Vincent Conti, Thoroughbred Horse Racing Systems and Methodologies, page 9

In a trifecta, you must wager on three horses: the one that finishes first (win), the one that finishes second (place), and the one that finishes third (show) in order.

2010, Leonard A. Asimow, Mark M. Maxwell, Probability and Statistics with Applications: A Problem Solving Text, page 10

Along with runtime errors, two other errors we saw earlier round out the JavaScript bug trifecta: syntax errors, logic errors, and runtime errors.

2007, Michael Morrison, Head First JavaScript, page 525

2011, Beatriz Scaglia, The Trifecta of Evil and the Crisis of Faith: Devil, Satan, and Lucifer‎

2011, Markus Horner, Consistently Persistent: Living with the Tourette Trifecta‎

I might never have learned my name or met my birth family if I hadn't ended up in the hospital in Rhode Island in 2007, after traveling to a trifecta of malaria hotspots: Mali, Egypt and Colombia.

2013 November 27, Emily Jane O'Dell, “Deep cover ”, in The New York Times‎