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Definition of Quadragesimo-octavo
1. Noun. (context: paper) A paper size, (2.5"-3.1" x 2.5"-3.3"), one forty-eighth of a standard uncut flat sheet. ¹
2. Noun. (printing) A book size, (2.5"-3.1" x 2.5"-3.3"), corresponding to the paper size. ¹
¹ Source: wiktionary.com