The quality or state of being able; capacity to do or of doing something; having the necessary power.
A unique power of the mind; a faculty.
A skill or competence in doing; mental power; talent; aptitude.
Physical power.
The legal wherewithal to act.
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.