Etymology
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professionalism (n.)

1846, "characteristic ideas or methods of professional persons," from professional (adj.) + -ism. In late 19c., in sports and amusements, sometimes with a negative sense, implying pursuit of some activity so marked as to be objectionable or offensive (1879).

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Definitions of professionalism

professionalism (n.)
the expertness characteristic of a professional person;
From wordnet.princeton.edu