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 or power to be effective.
[Technical documentation] An indication of the product, procedure, or timescale for which an item of information is applicable or effective.
A measure of the effectiveness of something.