She's fluent in French.
- She's fluent in French and English and has a working knowledge of Spanish.
- She was born in Italy but her English is fluent and idiomatic.
- I can make myself understood in French, but I'm not fluent.
- My partner is a fluent Russian speaker.
- He knows quite a lot of French, but he's not fluent yet.
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noun [ U ] us uk /-ən.si/