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Definition of Posterboard
1. Noun. A cardboard suitable for making posters.
Definition of Posterboard
1. Noun. Cardboard material suitable for making posters. ¹
2. Noun. A piece of such material. ¹
3. Noun. (context: direct marketing) A flyer printed on stiff cardboard, approximately 8.5 by 11 inches, mailed flat. ¹
¹ Source: wiktionary.com