The status, methods, character or standards expected of a professional or of a professional organization, such as reliability, discretion, evenhandedness, and fair play.
The use of professionals rather than amateurs in any sport etc.
Practical ability in some given field or practice, often as opposed to creativity or imaginative skill.
The practical aspects of a given art, occupation etc.; formal requirements.
A method of achieving something or carrying something out, especially one requiring some skill or knowledge.