January 2006, V5#1: Define Thursday, Jan 29 2009 

Binding Edge: Edge of text block that is attached by sewing or adhesive binding, etc.

Binding Margin (inner, gutter, or back margin): Margin where text block is attached: The distance between the binding edge of a printed page and the text area.

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October 2002: V1#2: Define Wednesday, Dec 24 2008 

Back/Backing: The binding process of dispersing the swelling of the spine of a rounded text block and shaping it into a shoulder on each side of the spine of a text block.  Backing accommodates the thickness of the boards, and provides a hinge along which they can swing freely.  Backing also helps to prevent the spine of the text block from collapsing into a concave shape over time.