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The market for parts and accessories used in the upkeep or enhancement of a previous purchase, as of a car or computer.
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.
1. (Commerce) business of supplying accessories and products related to cars etc
2. (Stock Exchange) stock exchange buying and selling of shares and bonds after issue
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
af•ter•mar•ket(ˈæf tərˌmɑr kɪt, ˈɑf-)
the market for parts, accessories, etc., for maintaining the original product.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.