double album

:  having a twofold relation or character :  dual

:  consisting of two usually combined members or parts

:  being twice as great or as many

:  to make twice as great or as many: such as

:  to increase by adding an equal amount

:  to amount to twice the number of

:  to twice the extent or amount

:  two together

:  downward and forward from the usual position

:  something twice the usual size, strength, speed, quantity, or value: such as

:  a double amount

:  a base hit that enables the batter to reach second base

:  a book with blank pages used for making a collection (as of autographs, stamps, coins, or photographs)

:  a cardboard container for a phonograph record :  jacket

:  one or more recordings (as on tape or disc) produced as a single unit