the (legal) power or right to control, give others and make others obey

power, control

the state of being competent

ability

a natural ability to do things

ability, skill

the measurable influence that causes an object to move or move faster or that makes a material or object able to bear weight

physical energy, power

calm courage, self-control, in the face of pain, danger or difficulty

strength of mind; guts

the power to reason (contrasted with emotions and instinct)

capability of the mind; someone with capable mind

the power to learn, understand and know; information, especially with reference to important events

ability to perceive, understand

Intelligence Quotient (a measure for comparing intelligence)

ability to perceive, understand

strength (especially of drugs)

effectiveness

potential (the usual word)

potential for development

the quality of being skilled

ability, skilfulness

a diploma, degree etc that proves a person has trained for something; something which restricts, modifies or limits

ability, aptitude

the ability (from training and practice) to do something well

ability, talent to do something

(an example of) natural ability (to do something well)

ability

diligence, stubbornness

diligence, stubbornness