4o
French, adverb/kwaʁ.to/
4o is spelled O (one letter) and appears about once in every 10 million words in written French, the 105,879th most frequent French word form (wordfreq, 2021 data). 4o is a French adverb meaning “4th (abbreviation of quarto)” (English Wiktionary, September 2026). The French Wiktionary (Wiktionnaire) defines it as “Quarto”.
What does 4o mean in English?
adverb
- 1
4th (abbreviation of quarto)
Source: English Wiktionary, French section, dump of September 2, 2026 (CC BY-SA 4.0).
How French dictionaries define it
adverb: 1. Quarto.
The definition in the French Wiktionary (Wiktionnaire), in French.
Source: French Wiktionary (Wiktionnaire), dump of September 1, 2026 (CC BY-SA 4.0), through kaikki.org.
Forms of 4o
- 4ᵒ canonical
Source: English Wiktionary and French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026).
How do you pronounce 4o?
- /kwaʁ.to/
- \kwaʁ.to\
Sources: English Wiktionary, French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026); recordings from Wikimedia Commons.
How common is 4o in French?
4o appears about once in every 10 million words in written French.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).