An organisation charged by the governing body of a country or region with the provision of postal services within that region.

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

(Britain) A translation of the Bible from the original Hebrew (Old Testament) and Greek (New Testament) commissioned for the Church of England.

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

(information science) A term prescribed by a controlled vocabulary as the one preferable to its synonyms, such as frequency preferable to pitch.

plural of authority figure

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 unitary authority