a binding in which the material used for the back extends further over the covers than in half binding.
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British Dictionary definitions for three-quarter binding
a bookbinding style in which the spine and much of the sides are in a different material (esp leather) from the rest of the covers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012