the state of being competent

ability

the quality of being convenient or suitable

availability, usefulness; useful thing

the state, quality, of being efficient

adeptness, effectiveness

expediency

suitableness, appropriateness

the state of being correct in behaviour and morals

suitableness, appropriateness

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

ability, aptitude