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British Dictionary definitions for register mark

register mark

noun
  1. printing any of several marks incorporated on to printing plates to assist in the accurate positioning of images during printing
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