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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).
Representing the prevalent attitudes, values, and practices of a society or group: mainstream morality.
tr.v. main·streamed, main·stream·ing, main·streams
1. To integrate (a student with special needs) into regular school classes.
2. To incorporate into a prevailing group.