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
(usually with the) That which is common; the norm.
verb
(transitive) To popularize, to normalize, to render mainstream.
(intransitive) To become mainstream.
(transitive, education, chiefly US) To educate (a disabled student) together with non-disabled students.