Blandly conventional, especially when considered as typical of white middle-class America: "The proven ability of blacks to appeal to mainstream America ... shattered forever the mythology that only white-bread 'mainstream' culture could sell” ( Joel Kotkin).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.