1. the skill, competence, and ethical conduct expected of a professional in their field
2. the practice of earning one's living from an activity or skill rather than as a hobby or amateur pursuit
3. a manner or bearing that reflects seriousness, responsibility, and respect for standards in one's work

Examples

• The lawyer's professionalism impressed the judge and the clients.
• She brought professionalism to every project, meeting deadlines and maintaining high quality.
• The team showed a lack of professionalism by arriving late and unprepared.
• Professionalism in healthcare requires both technical skill and compassion for patients.
• His professionalism was evident in how he handled the difficult situation with calm and respect.
• The company values professionalism and expects employees to dress appropriately and communicate clearly.