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1. An organization that makes books available to members for purchase at a discount.
2. A group of readers who meet periodically to discuss assigned books.
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.
(Journalism & Publishing) a club that sells books at low prices to members, usually by mail order, esp on condition that they buy a minimum number
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an organization that sells books to its subscribers, usu. through the mail and often at a discount.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.