the state of being adequate

ability, competency in some

an arrangement or understanding (spoken or written) made by two or more people, governments etc

concurrence

harmony of spoken or musical sounds

agreement, consistency

the quality of being convenient or suitable

availability, usefulness; useful thing

the state, quality, of being efficient

adeptness, effectiveness

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

ability, aptitude