Dictionary.net

an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority"

freedom from doubt; belief in yourself and your abilities; "his assurance in his superiority did not make him popular"; "after that failure he lost his confidence"; "she spoke with authority"

(usually plural) persons who exercise (administrative) control over others; "the authorities have issued a curfew"

an expert whose views are taken as definitive; "he is an authority on corporate law"

an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority"

freedom from doubt; belief in yourself and your abilities; "his assurance in his superiority did not make him popular"; "after that failure he lost his confidence"; "she spoke with authority"

(usually plural) persons who exercise (administrative) control over others; "the authorities have issued a curfew"

an expert whose views are taken as definitive; "he is an authority on corporate law"

Legal or rightful power; a right to command or to act; power exercised buy a person in virtue of his office or trust; dominion; jurisdiction; authorization; as, the authority of a prince over subjects, and of parents over children; the authority of a court.

Government; the persons or the body exercising power or command; as, the local authorities of the States; the military authorities.

The power derived from opinion, respect, or esteem; influence of character, office, or station, or mental or moral superiority, and the like; claim to be believed or obeyed; as, an historian of no authority; a magistrate of great authority.

That which, or one who, is claimed or appealed to in support of opinions, actions, measures, etc.

Testimony; witness.

A precedent; a decision of a court, an official declaration, or an opinion, saying, or statement worthy to be taken as a precedent.

Justification; warrant.

Legal or rightful power; a right to command or to act; power exercised buy a person in virtue of his office or trust; dominion; jurisdiction; authorization; as, the authority of a prince over subjects, and of parents over children; the authority of a court.

Government; the persons or the body exercising power or command; as, the local authorities of the States; the military authorities.

The power derived from opinion, respect, or esteem; influence of character, office, or station, or mental or moral superiority, and the like; claim to be believed or obeyed; as, an historian of no authority; a magistrate of great authority.

That which, or one who, is claimed or appealed to in support of opinions, actions, measures, etc.

Testimony; witness.

A precedent; a decision of a court, an official declaration, or an opinion, saying, or statement worthy to be taken as a precedent.

Justification; warrant.

Power or right to act or command; dominion; power derived from respect or reputation; influence; justification or support for statement or action; a person with, or given, power to act or command; a ruler; one to whom appeal or reference can be made.

Legal power or right: power derived from office or character: weight of testimony: permission:-pl. AUTHORITIES, precedents: opinions or sayings carrying weight: persons in power.

Power; sway; rule; source; permission.

The right to command; power; control.

A ruler or rulers; that which commands confidence.

n. Legal or rightful power to command or act; dominion; –influence of character, office, station; –mental or moral superiority, and the like; –a decision of a court; official declaration, opinion, or statement worthy to be taken as a precedent; a book that contains such, or the name of its author; –pl. the executive powers.

Legal power; influence, credit; power, rule; support, countenance; testimony; credibility.