What is the meaning of Trifecta?

A bet in which the bettor must select the first three placegetters of a race in the order in which they finish.

The attainment of three important achievements, qualities, etc.

A set of three related things, often things that cause problems.

The complete legislative and executive control of state or federal government by one party: governorship, the upper house, and the lower house of state or federal legislatures.

Source: wiktionary.org

See also