Definitions from Wiktionary (mainstream)

▸ adjective:  Used or accepted broadly rather than by small portions of population, market, scientific community, etc.
▸ noun:  The principal current in a flow, such as a river or flow of air
▸ noun:  (usually with the) That which is common; the norm.
▸ verb:  (transitive) To popularize, to normalize, to render mainstream.
▸ verb:  (intransitive) To become mainstream.
▸ verb:  (transitive, education, chiefly US) To educate (a disabled student) together with non-disabled students.
▸ Also see mainstream

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