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Definition of 4to
1. Noun. The size of a book whose pages are made by folding a sheet of paper twice to form four leaves.
Definition of 4to
1. Noun. (context paper) (abbreviation) of quarto, a paper size. ¹
2. Noun. (printing) (abbreviation) of quarto, a corresponding book size. ¹
¹ Source: wiktionary.com