noun · 4 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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Received-Pronunciation:/ˈkwɔː.təʊ/
General-American:/ˈkwɔɹ.toʊ/
US:Recorded audio is listed in the source snapshot.
CMU ARPABET:K W AO1 R T OW0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
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).
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Qualifier: paper
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
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).
Quarto writing paper (10 inches x 8 inches)
Definition source: English Wiktionary via Wiktextract
Usage: UK, countable, uncountable
Qualifier: paper
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
A book size, corresponding to the paper size.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: media, printing, publishing
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
the size of a book whose pages are made by folding a sheet of paper twice to form four leaves
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: 4to
Antonyms: none provided
Broader terms: size
History
Etymology
From Latin quartus (“fourth”).
Across languages
Translations
3 source translations are retained for this English entry.