Practitioner (noun)

1. A person who engages in a particular activity or profession.
2. A person who practices a particular profession, such as a medical doctor or lawyer.
3. A person who engages in a particular activity as a hobby, such as a practitioner of yoga.

Origin:

Mid 17th century: from practice + -er.

Examples:

1. He is a practitioner of traditional medicine.
2. She is a practitioner of law.
3. He is a practitioner of martial arts.
4. She is a practitioner of yoga.
5. He is a practitioner of meditation.