The mainstream is the prevalent current thought that is widespread. It includes all popular culture and media culture, typically disseminated by mass media. to make something become accepted as normal by most people: The recession is mainstreaming the part-time economy. (Definition of mainstream. The term mainstream refers to the main current of a river or stream. Its figurative use by Thomas Carlyle to indicating the prevailing taste or mode is attested. Mainstream definition is - a prevailing current or direction of activity or influence. How to use mainstream in a sentence. Mainstream: Directed by Gia Coppola. With Maya Hawke, Andrew Garfield, Kalena Yiaueki, Nat Wolff. In this cautionary tale, three people struggle to preserve. mainstream meaning, definition, what is mainstream: accepted by or involving most people in : Learn more. Critic Reviews for Mainstream · Once "Mainstream" locks into its purpose - showing the vapidity, cruelty and calculation of certain YouTube stars - it soars. · A. Watch trailers, read customer and critic reviews, and buy Mainstream for $ Mainstream Group Holdings Limited is a specialist third party administrator for the financial services industry. We have specialist teams in investment. IPA by MainStream Brewery is a IPA - English which has a rating of out of 5, with ratings and reviews on Untappd.