1a. Of, relating to, engaged in, or suitable for a profession: lawyers, doctors, and other professional people.b. Conforming to the standards of a profession: professional behavior.2. Engaging in a given activity as a source of livelihood or as a career: a professional writer.3. Performed by persons receiving pay: professional football.4. Having or showing great skill; expert: a professional repair job.
NOUN:
1. A person following a profession, especially a learned profession. 2. One who earns a living in a given or implied occupation: hired a professional to decorate the house.3. A skilled practitioner; an expert.