Professionalism (noun)

1. The conduct, aims, or qualities that characterize or mark a profession or a professional person.
2. The expertness or skill expected of a professional.

Origin:

From profession + -al + -ism, formed by combining the noun profession, which refers to a type of work or occupation that requires specialized education or training, and the suffix -ism, which denotes a characteristic or practice.

Examples:

1. The lawyer showed great professionalism in the way he handled the case.
2. The doctor's professionalism was evident in the way he treated his patients.
3. The teacher's professionalism was reflected in her commitment to her students.
4. The company expects its employees to maintain a high level of professionalism at all times.
5. The salesman's professionalism helped him close the deal.