IPA: /kəmˈpɛtənsi/
KK: /kəmˈpɛtənsi/
The ability to do something successfully or efficiently; having the necessary skills or knowledge to perform a task.
Her competency in project management helped the team meet their deadlines.
Competency → It is formed from "com-" (meaning together) and "petere" (meaning to seek or strive). The word refers to the ability to seek or strive together in a particular area of knowledge or skill, indicating a level of proficiency or capability.
Think of people 'striving together' ('com-') to achieve a certain level of skill or knowledge, which is what competency means.