"Mainstream cinema" refers to movies that are widely popular and appeal to a broad audience. These films are typically released by major production companies and are promoted heavily to attract large numbers of viewers. Full definition
The result is what may be the first openly gay action hero in mainstream cinema. (contactmusic.net)
A few minor technical issues aside, Black Panther is a ground - breaking, thoroughly enjoyable and truly epic piece of mainstream cinema. (thehollywoodnews.com)
Also, competitions have the tendency to produce debate, and that's a rare, wonderful thing in modern mainstream cinema culture. (sensesofcinema.com)