- two games, as of baseball, between the same teams on the same day in immediate succession.
- two games, as of basketball, between two different pairs of teams on the same day in immediate succession.
- doubleday, abner,
- doublet pattern
Origin of doubleheader
Examples from the Web for double-header
It's a double-header, I saw a big squall like that off Savaii once.A Son Of The Sun|Jack London
Along about three-forty o'clock, they made up a freight train to go out called a double-header—two engines attached to the train.
Soon they were having as many spectators at a single game as they had formerly looked for at a double-header.Baseball Joe, Home Run King|Lester Chadwick
Then me and four officers were detailed to go on board of a double-header.
A lot of the police jumped on the train to help take it out—a double-header.