boost·er·ism (bo?o?st?-r?z??m)n. The highly supportive attitudes and activities of boosters.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.boosterism (?bu?st??r?z?m) n (Marketing) the practice of actively promoting a city, region, etc, and its local businessesCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014boost?er?ism (?bu st??r?z ?m) n. the action or policy of enthusiastically promoting something, as a city, product, or service. [1910?15] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.