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Definition of Quarto
1. Noun. The size of a book whose pages are made by folding a sheet of paper twice to form four leaves.
Definition of Quarto
1. a. Having four leaves to the sheet; of the form or size of a quarto.
2. n. Originally, a book of the size of the fourth of sheet of printing paper; a size leaves; in present usage, a book of a square or nearly square form, and usually of large size.
Definition of Quarto
1. the size of a piece of paper cut four from a sheet [n -TOS]