e-read·er (??r??d?r)n. A small, portable device onto which the contents of a book in electronic format can be downloaded and read.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.e-reader n (Communications & Information) a portable device that allows users to download and read texts in electronic form [C21: from e-2 + reader]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014