Definitions for 4to
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Princeton's WordNet
quarto, 4to(noun)
the size of a book whose pages are made by folding a sheet of paper twice to form four leaves
Wiktionary
4to(Noun)
of quarto, a paper size.
4to(Noun)
of quarto, a corresponding book size.
Origin: From ablative of quartus
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"4to." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/4to>.

