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preview (n.)

"a foretaste," 1880, from preview (v.); specifically "a showing of a book, film, etc. before public release" from 1920.

preview (v.)

c. 1600, "to see beforehand," from pre- + view (v.). Meaning "to show (a film, etc.) before its public opening" is from 1928. Related: Previewed; previewing.