What does album mean?
The definition of album
Al”bum, n.
Etym: [L., neut. of albus white: cf. F. album. Cf. Alb.]

1 (Rom. Antiq.)
A white tablet on which anything was inscribed, as a list of names, etc.
2 A register for visitors’ names; a visitors’ book.
3 A blank book, in which to insert autographs sketches, memorial writing of friends, photographs, etc.