What bookdealers really mean. A dictionary by Tom Congalton and Dan Gregory (Between the Covers), with additions from other sources
The binding of individual sheets of paper in an exchangeable form, for pages to be added, removed, or relocated in the book. Loose-leaf bindings are used wherever records of repeatedly changing information must be kept. Instruction manuals, catalogs, and accounting forms are often loose-leaf bound. Also known as ring-bound.