(Australia, New Zealand, UK, law) A body set up by law which is authorised to enforce legislation on behalf of the relevant country or state.

In local government, a single-tier authority which replaces a two-tier structure. For example, in England, county councils are abolished and their responsibilities are transferred to boroughs and local government districts (but this only applies to some counties, not all). In some cases complete counties, such as Cornwall and Northumberland, are now unitary authorities without any subdivision into local government districts.

plural of authority figure

(business) The authority of an employee acting unilaterally to commit an employer to a contract. / (business) The maximum value of such contract.

(euphemistic) Disobedience, a disinclination to obey.

(Canada, US law) The claimed legitimization of a person's acts by his/her role as an agent of governmental power.

(computing) An organization that issues digital certificates for use by other parties.

(aviation) The degree of control that the rudder can exert over the yawing motion of an aircraft; related to rudder design and airspeed.

(aviation) The degree of control that the ailerons can exert over the rolling motion of an aircraft; related to aileron design and airspeed.

(aviation) The degree of control that the elevators can exert over the pitching motion of an aircraft; related to elevator design and airspeed.