the.com/practitioner

means A person who actively works in a profession or skill, especially one requiring trained judgment, like medicine, law, or martial arts.

from From 'practice,' which traces back through French to Latin 'practicus' and Greek 'praktikos' — meaning fit for action or doing. The Greek root 'prattein' meant simply 'to do' or 'to accomplish.' A 'practitioner,' then, is literally just someone who does the doing — though English quietly bolted on the idea that they've done it enough times to be trusted with your body, your case, or your money.