a binding, as for a notebook or booklet, in which the pages are fastened together by a spiral of wire or plastic that coils through a series of holes punched along one side of each page and the front and back covers.
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British Dictionary definitions for spiral binding
bookbinding a method of securing the pages of a publication by passing a coil of wire through small holes punched at the back edge of the covers and individual pages
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