English definition of “professional”
/prəˈfeʃənəl/ noun [C]
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 › someone who earns money for doing a sport or activity which most other people do as a hobby: a rugby professional → Opposite amateur noun