(usually with the) That which is common; the norm.His ideas were well outside the mainstream, but he presented them intelligently, and we were impressed if not convinced.
(transitive) To educate (a disabled student) together with non-disabled students.Mainstreaming has become more common in recent years, as studies have shown that many mainstreamed students with mild learning disabilities learn better than their non-mainstreamed counterparts.
(transitive) To popularize, to normalize, to render mainstream.