Pronunciation: /prəˈfɛʃ(ə)n(ə)l/
adjective
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1relating to or belonging to a profession: young professional people
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worthy of or appropriate to a professional person; competent, skilful, or assured: his professional expertise their music is both memorable and professional
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2engaged in a specified activity as one’s main paid occupation rather than as an amateur: a professional boxer
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informal, derogatory habitually making a feature of a particular activity or attribute: a professional gloom-monger
noun
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a person engaged or qualified in a profession: professionals such as lawyers and surveyors
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a person engaged in a specified activity, especially a sport, as a main paid occupation rather than as a pastime: his first season as a professional
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a person competent or skilled in a particular activity: she was a real professional on stage