mainstream n 1: the prevailing current of thought; "his thinking was in the American mainstream"
mainstream \main"stream`\ n. The prevailing opinion or practise; as, the doctor avoided using therapies outside the mainstream of modern medical practice. [PJC]
mainstream \main"stream`\ v. t. (Education) TO place (a student) in regular school classes; -- used especially of mentally or physically handicapped children. [WordNet 1.5]
21 Moby Thesaurus words for "mainstream": Zeitgeist, bearing, course, current, direction, drift, glacial movement, line, main current, motion, movement, run, set, stream, swing, tenor, the general tendency, the main course, time spirit, tone, trend