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The US advertising industry.
Of, relating to, or working in the US advertising industry.
[After Madison Avenue in New York City, historically the center of the industry.]
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.
(Placename) a street in New York City: a centre of American advertising and public-relations firms and a symbol of their attitudes and methods
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. an avenue in New York City, once the principal location for advertising firms.
2. the U.S. advertising industry.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.