Define the term 'professional'?
As an adjective, the term "professional" means relating to
activities, especially sports or the arts, usually requiring
extensive training or education that people perform to earn a
livelihood. As a noun, the term refers to a person performing an
activity or line of work, especially a sport or one of the arts,
usually requiring extensive training or education as a means of
earning a living. The noun use of the term also refers to a person
who is very skilled or methodical in the pursuit of his or her
profession.