olemus
ÕS, peavoolu+:
valdkonnas valitsevat suunda esindav, vastand alternatiiv-

Wiktionary, adj:
used or accepted broadly rather than by small portions of a population or market
They often carry stories you won't find in the mainstream media.

Merriam-Webster:
noun: a prevailing current or direction of activity or influence
adj: having, reflecting, or being compatible with the prevailing attitudes and values of a society or group
// mainstream media
// movies that appeal to a mainstream audience
// mainstream success

ülevaateid
https://diffsense.com/diff/conventional/mainstream

https://en.wikipedia.org/wiki/Mainstream

http://www.stes-apes.med.ulg.ac.be/Documents_electroniques/EVA/EVA-GEN/ELE%20EVA-GEN%207564.pdf

https://en.wikipedia.org/wiki/Mainstream_media

https://letter.ly/what-is-mainstream-media/

https://www.quora.com/What-is-the-difference-between-mainstream-and-alternative-journalism

https://www.quora.com/What-is-the-difference-between-mass-media-and-mainstream-media