Ministry (collective executive)
In constitutional usage in Commonwealth realms, a ministry (usually preceded by the definite article, i.e., the ministry) is a collective body of government ministers led by a head of government, such as a prime minister.[1] It is described by Oxford Dictionaries as "a period of government under one prime minister".Other titles can include "administration" (in the United States) or "government" (in common usage among most parliamentary systems) to describe similar collectives.The term is primarily used to describe the successive governments of the United Kingdom, Canada, Australia and New Zealand,[3] which share a common political heritage.In the United Kingdom, Canada and New Zealand, a new ministry is formed only when there is a change of prime minister.