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A group of 13.
[From the former custom among bakers of adding an extra roll as a safeguard against the possibility of 12 weighing light.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
[C16: from the bakers' former practice of giving thirteen rolls where twelve were requested, to protect themselves against accusations of giving light weight]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a group of 13; a dozen plus one.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
1. Thirteen items; from a former practice by bakers of giving a free thirteenth roll or loaf to a customer who bought a dozen.
2. An amount of 13.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited