Meaning of the word "Language proficiency" in English

What does "Language proficiency" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

Language proficiency

US /ˈlæŋɡwɪdʒ prəˈfɪʃənsi/
UK /ˈlæŋɡwɪdʒ prəˈfɪʃənsi/

Noun

the ability to speak or perform in a language well

Example:
Her language proficiency in French is excellent.
The job requires a high level of language proficiency in English.