Proficiency/prəˈfɪʃnsi/ Definition 1 of 2Pro Tip 1/3Skillful Performance Proficiency implies a high level of skill gained through practice. Her piano performance reflected years of proficiency. Pro Tip 2/3Not Beginner Proficiency is more than just basic knowledge; it indicates expertise. Only candidates with proficiency in web design should apply. Pro Tip 3/3Impressive Ability Being proficient can impress others and open up opportunities. His proficiency in negotiations secured the deal.