RhymeZone: triple-header definitions

Definitions of triple-header:

noun: (sports) Three games played one after another between the same teams.
noun: Three sporting events, one after the other, at a single venue.
noun: Three sporting events, one after the other, broadcast on the same television channel.
noun: (by extension) Three similar events of any kind performed on the same day.

(Definitions from Wiktionary)