English definition of “professional”
JOB [always before noun] › relating to a job that needs special training or education: You should get some professional advice about your finances.
EARNING MONEY › Someone is professional if they earn money for a sport or activity which most people do as a hobby: a professional athlete/musician a professional golf championship → Opposite amateur adjective
SKILL › showing skill and careful attention: a professional attitude He looks very professional in that suit. → Opposite unprofessional