1. Of, relating to, engaged in, or suitable for a profession: lawyers, doctors, and other professional people. 2. Conforming to the standards of a profession: professional behavior. 3. Engaging in a given activity as a source of livelihood or as a career: a professional writer. 4. Performed by persons receiving pay: professional consultant. 5. Having or showing great skill; expert: a professional repair job. 6. A person following a profession, especially a learned profession. 7. One who earns a living in a given or implied occupation: hired a professional to build the house. 8. A skilled practitioner; an expert.

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