Outside or beyond the realm of popularity; not widely known, liked, or accepted by the general public.
From Latin 'extra' (outside) + 'popularis' (of the people, from 'populus'). A rare literary term contrasting what is mainstream with what lies outside public favor.
Jazz musicians in the 1920s were considered 'extrapopular'—respected by musicians but unknown to most people—until some styles suddenly crossed into mainstream popularity, showing how fame isn't fixed.
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