1. in a manner relating to or belonging to a profession or occupation
2. in a competent, skillful, or businesslike manner befitting a professional
3. in a way that is appropriate to or expected of a professional; with proper conduct and standards

Examples

• She handled the difficult client situation professionally and calmly.
• He works professionally as an architect for a large firm.
• The team performed professionally despite the challenging conditions.
• They dressed professionally for the job interview.
• She spoke professionally about her research findings at the conference.
• The company was professionally managed by experienced executives.