hinge meaning in Information Science terminology / glossary / dictionary is:
A narrow strip of muslin or paper attached with adhesive along the line dividing the two halves of an endpaper to reinforce the flexible joint along which the body of a book is attached to the cover. In volumes lacking this reinforcement, the hinge is formed by adhering the covering material (leather, cloth, paper, etc.) directly to the fold in the endpaper. A loose hinge is one that allows the book block to shift inside the binding, usually because the hinge material has pulled away from the boards (see this example). See also: broken hinge.Also refers to a narrow cloth or paper stub inserted along the binding edge between the pages of a book to allow a map or added leaf to flex easily when the volume is opened. Synonymous in this sense with guard.