1
as in mastery
a highly developed skill in or knowledge of something surprised by his proficiency at the game after only the briefest explanation of the rules

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2
as in skills
knowledge gained by actually doing or living through something acquired proficiency at golf through long hours of practice

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“Proficiency.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/proficiency. Accessed 14 Jun. 2024.

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