As a noun, it is a short look at something, like a movie or event, before it is officially available. As a verb, it means to see or show something in advance.
From *pre-* meaning 'before' and *view* meaning 'see'. It was formed in English to describe seeing things ahead of time.
A preview is like a time teaser—you borrow a tiny piece of the future to decide if you want the rest. Movie trailers, demo versions, and sample chapters are all previews trying to hook your attention. The whole attention economy runs on carefully edited glimpses.
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