The term ‌"professional" in English‌ refers to someone who is highly skilled, trained, or experienced in a specific field, adhering to ethical standards and best practices. It can describe both individuals (e.g., doctors, lawyers) and qualities (e.g., behavior, work ethic).

Key Aspects of "Professional" in English:

1. ‌Occupational Meaning‌ – A professional is someone formally qualified in a specialized area, such as medicine, law, or engineering.
2. ‌Behavior & Conduct‌ – Being professional implies reliability, respect, and adherence to workplace norms (e.g., punctuality, communication).
3. ‌Certification & Standards‌ – Many professions require licenses or certifications (e.g., CPA for accountants).
4. ‌Industry-Specific Usage‌ – In sports, "professional" contrasts with "amateur," indicating paid participation.
5. ‌Adjective Form‌ – Describes high-quality work (e.g., "professional presentation") or formal settings (e.g., "professional attire").

In summary, "professional" encompasses expertise, conduct, and credibility. Whether describing a person or a standard, it signifies competence and trustworthiness in any field.