co-
French, prefix/ko/
co- is spelled C-O (2 letters) and appears 45 times per million words in written French, the 1,857th most frequent French word form (wordfreq, 2021 data). Co- is a French prefix meaning “co- (together; jointly)” (English Wiktionary, September 2026). The French Wiktionary (Wiktionnaire) defines it as “Exprime l'adjonction, la réunion, le parallélisme, la simultanéité, l'identité”.
What does co- mean in English?
prefix
- 1
co- (together; jointly)
Source: English Wiktionary, French section, dump of September 2, 2026 (CC BY-SA 4.0).
How French dictionaries define it
noun: 1. Connexion.
noun: 1. Autre orthographe de côt (cépage de Touraine).
verb: 1. Connecter.
prefix: 1. Exprime l'adjonction, la réunion, le parallélisme, la simultanéité, l'identité. 2. Préfixe signifiant que l'objet est la contrepartie d'un autre objet, un concept dual, ou en opposition.
noun: 1. Compteur ordinal.
noun: 1. (Fribourg, Genève et Valais) Cycle d’orientation, établissement d’enseignement secondaire du premier cycle.
noun: 1. Dioxyde de carbone.
noun: 1. Mesure de volume chinoise.
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 co-
- CO₂ ou CO₂ canonical
- ços plural
Source: English Wiktionary and French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026).
How do you pronounce co-?
- /ko/
- /kɔ/
- \ko\
Sources: English Wiktionary, French Wiktionary (Wiktionnaire) (dumps of September 2, 2026 and September 1, 2026); recordings from Wikimedia Commons.
English words that translate to co-
Source: the translation tables of the English Wiktionary, dump of September 2, 2026.
How common is co- in French?
co- appears 45 times per million words in written French.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).