IPA: /prəˈfɪʃənsi/
KK: /prəˈfɪʃənsi/
The state of being skilled or knowledgeable in a particular area or subject.
Her proficiency in multiple languages helped her get the job.
Proficiency → It is formed from "proficere" (meaning to advance or make progress) and the suffix "-cy" (indicating a state or condition). The word "proficiency" refers to the state of being advanced or skilled in a particular area.
Think of making progress ('proficere') in a skill, which helps you remember that proficiency means being skilled or advanced in something.