The ability to do a task, performance, or execution; a set of functions that something is able or equipped to perform.
The presence of a functional group.
In United States trademark law, the tendency of a product design to serve a function other than identification of the product, preventing that design from being protected as a trademark.
A method of achieving something or carrying something out, especially one requiring some skill or knowledge.
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.