4to

A form of quarto — A size of paper (7.5"-10" x 10"-12.5" or 190-254 x 254-312 mm). Formed by folding and cutting one of several standard sizes of paper (15"-20" x 20"-25" or 381-508 x 508-635 mm) twice to form 4 leaves (eight sides).

Similar
4ºQquarto
OriginLatin quārtō →
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Meanings

noun4to (countable and uncountable, plural 4tos)

plural 4tos

  1. abbreviationcountableuncountablepaperAbbreviation of quarto, a paper size.

    Synonyms: 4º

  2. abbreviationcountableuncountablemediaAbbreviation of quarto, a corresponding book size.

    Synonyms: Q, 4º

Synonyms & antonyms

More synonyms by meaning

nounthe size of a book whose pages are made by folding a sheet of paper twice to form four leaves

Similar
quarto
Broader
size
Also see
quarto

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latinquārtō
  2. English4to

From Latin quārtō, ablative case singular of quārtus (“fourth”).

More words from Latin

Full word history & related roots →
Cite this entry
APA

4to. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/4to

MLA

“4to.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/4to. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “4to,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/4to.

Source: 4to on Wiktionary, CC BY-SA 4.0.