Plural of preview; advance showings or samples of movies, books, or other works before their official release.
Compound of 'pre-' (before) + 'view'. Emerged in early 20th century with cinema, where audiences could see portions of upcoming films before their release.
Movie previews were originally shown after the main feature (hence 'trailers'), but audiences often left before seeing them, so studios moved them to before the movie - though we still call them trailers!
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