main·stream (mān'strēm') n. The prevailing current of thought, influence, or activity: "You need not accept the nominee's ideology, only be able to locate it in the American mainstream"(Charles Krauthammer). adj. Representing the prevalent attitudes, values, and practices of a society or group: mainstream morality. tr.v.
main·streamed, main·stream·ing, main·streams
To integrate (a student with special needs) into regular school classes.