main·stream / ˈmānˌstrēm/ • n. (the mainstream) the ideas, attitudes, or activities that are regarded as normal or conventional; the dominant trend in opinion, fashion, or the arts: companies that are bringing computers to the mainstream of American life. ∎ (also mainstream jazz) jazz that is neither traditional nor modern, based on the 1930s swing style and consisting esp. of solo improvisation on chord sequences.• adj. belonging to or characteristic of the mainstream: mainstream politics a mixture of mainstream and avant-garde artists. ∎ (of a school or class) for students without special needs: children with minor handicaps would be able to attend mainstream schools.• v. [tr.] (often be mainstreamed) bring (something) into the mainstream: vegetarianism has been mainstreamed. ∎ place (a student with special needs) into a mainstream class or school: students with serious disabilities who are fully mainstreamed into student life.