Definition from Wiktionary, the free dictionary
- (film, uncountable) A period of time during which the camera rolls but before the action begins.
- (Internet, advertising, countable) An advertisement that plays before the main content.
2009 July 27, Brooks Barnes, “Lab Watches Web Surfers to See Which Ads Work”, in New York Times:
- Are ads that play before video clips, known as prerolls, more effective when paired with banner ads?
- (advertisement before main content): intromercial
- To roll something in advance.
- To make or show a preroll.