Definition: Typically accordian folds are simple zig-zag folds with 6-panels and two parallel folds that go in opposite directions. Each panel of the accordian fold is about the same size.
Variations include half-accordian folds where one panel is half the size of the other two and engineering folds where one panel is twice the size of the other two. Eight and 10-page accordian folds are also common.
Also Known As: z fold | zig-zag