adept

Etymology

From French adepte, from Latin adeptus (“who has achieved”), the past participle of adipisci (“to attain”).

adj

1. Well skilled; completely versed; thoroughly proficient

noun

1. One fully skilled or well versed in anything; a proficient
   adepts in philosophy
   When he had achieved this task, he applied himself to the acquisition of stable language, in which he soon became such an adept, that he would perch outside my window and drive imaginary horses with great skill, all day. 1841, Charles Dickens, Barnaby Rudge
   Others, alas, had an instinct towards artificiality in their very blood, and became adepts in counterfeiting at the first glimpse of it. 1894-95, Thomas Hardy, Jude the Obscure