Meaning of “professional” - Learner’s Dictionary

professional

noun [ C ] uk us /prəˈfeʃənəl/
TRAINED

someone who does a job that needs special training or education

WITH EXPERIENCE

someone who has done a job for a long time and who does it with a lot of skill:

She dealt with the problem like a true professional.
SPORTS

B2 someone who earns money for doing a sport or activity that most other people do as a hobby:

a rugby professional
→ Opposite amateur noun

(Definition of “professional noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)