A trained aide who assists a professional person, usually in a medical setting.
In education, a person working in a school who is not fully trained and licensed as a teacher, but who performs educational duties, such as tutoring and monitoring study halls.
Somebody with training who acts as an assistant to a professional person.
A person with education and training in a specific area of one of the professions (e.g., medicine or law) who provides services in that profession as an extension of an individual licensed to practice independently.