From Longman Dictionary of Contemporary Englishmainstreammain‧stream1 /ˈmeɪnstriːm/ ●○○ noun → the mainstream
Examples from the Corpusmainstream• You know e-mail has gone mainstream when Uncle Sam is developing an electronic postmark to time and date stamp e-mail.mainstreammainstream2 adjective [only before noun] SEaccepted by or involving most people in a society Deaf children can often be included in mainstream education. the mainstream political parties
Examples from the Corpusmainstream• Most disabled students are integrated into the mainstream educational system.• After starting out as a romance novelist, she decided to try writing mainstream fiction.• But we know a good deal about the performance of the mainstream media.• The mainstream political parties are losing support to smaller, more radical organizations.mainstreammainstream3 verb [transitive] American English to include a child with physical or mental problems in an ordinary class —mainstreaming noun [uncountable]→ See Verb table
Examples from the Corpusmainstream• If the teacher does not personally judge, label, reject, or pass upon individuals, then mainstreaming can work.• The alert library media specialist will have recognized at once that mainstreaming is, after all, a kind of integration.From Longman Business Dictionarymainstreammain‧stream1 /ˈmeɪnstriːm/ noun1the mainstream of something the most usual way of doing something or thinking about somethingDepression-era laws have kept banks out of the mainstream of financial change.2the mainstream the people whose ideas about a subject are shared by most people and regarded as normalHe told readers he was trying to move the newspaper out of the opposition into the mainstream.mainstreammainstream2 adjective1relating to the most frequent or usual way of doing or thinking about somethingThe company has been selling interests that it considers to be outside its mainstream businesses.The shop now caters for the mainstream market.2suitable for normal people, rather than for a particular section of societyThey made the clothes less high-fashion and more mainstream.