Definitions from Wiktionary (professional)

▸ noun:  A person who belongs to a profession.
▸ noun:  A person who earns their living from a specified activity.
▸ noun:  (euphemistic) A prostitute.
▸ noun:  A reputation known by name.
▸ noun:  An expert.
▸ noun:  One of four categories of sociologist propounded by Horowitz: a sociologist who is actively concerned with promoting the profession of sociology.
▸ adjective:  Of, pertaining to, or in accordance with the (usually high) standards of a profession.
▸ adjective:  That is carried out for money, especially as a livelihood.
▸ adjective:  (by extension) Expert.

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