from
The Collaborative International Dictionary of English v.0.48
doubleheader \doubleheader\ n.
two events, usually entertainment or sports performances,
occurring immediately in succession or within a short time of
each other; especially, two sports games played by the same
teams on the same day, one right after another.
Note: A doubleheader in baseball is often scheduled between
teams when a previously shceduled game is postponed, as
due to rain or other interfering factors. In such
cases, the admission price for the doubleheader remains
that of a single game, though two games are played.
Syn: twin bill, double feature.
[WordNet 1.5]