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English definition of “professional”

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professional

noun [C]  /prəˈfeʃ·ə·nəl/ us  
a person who has a job that needs skill, education, or training: Don’t you wish you had hired a professional to paint your house? Many of these homes have been restored by young professionals.

professional

adjective  /prəˈfeʃ·ə·nəl/ us  
done as a job, or relating to a skilled type of work: a professional athlete professional sports He spent his professional career at the University of Pennsylvania. Professional also means having the qualities of skilled and educated people, such as effectiveness and seriousness of manner: Wearing jeans to work is not looked upon as being professional.
professionally
adverb  /prəˈfeʃ·ə·nəl·i/ us  
I always wanted to sing professionally.
(Definition of professional from the Cambridge Academic Content Dictionary © Cambridge University Press)
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