Definition of "Authority" :

noun: official permission or approval

"Authority for the program was renewed several times."

noun: the power or right to give orders or make decisions

"He has the authority to issue warrants."

noun: freedom from doubt; belief in yourself and your abilities

"She spoke with authority."

noun: an authoritative written work

"This book is the final authority on the life of Milton."

noun: an administrative unit of government

"Tennessee Valley Authority."

noun: an expert whose views are taken as definitive

"He is an authority on corporate law."

noun: (usually plural) persons who exercise (administrative) control over others