Definition of "mainstream" []

• 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). (noun)
• Representing the prevalent attitudes, values, and practices of a society or group: mainstream morality. (adjective)
• To integrate (a student with special needs) into regular school classes. (verb-transitive)
• To incorporate into a prevailing group. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I agree with your points about HRW, but can we limit the use of the term mainstream media."
• "He says the problems in Inner Mongolia, which he says is a sensitive ethnic region similar to restless Tibet and Xinjiang, reflect growing grievances in what he describes as mainstream Chinese society."
• "Zeitgeist is the general cultural, intellectual, ethical, spiritual, and/or political climate within a nation or even specific groups, along with the general ambience, morals, and sociocultural direction or mood of an era (similar to the English word mainstream or trend)."