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In advertising, an onsert is a separate advertisement put in a magazine, newspaper, or other publication. Onserts are affixed to a page, and may be a sample of a product, a compact disk, magnet, a small booklet or even a targeted advertisement.
- Halo (May 2, 2008). "What the Hell is...Onsert?". The Halo Group. Retrieved October 18, 2014.
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