The post of primeminister is one which may be encountered both in constitutional monarchies (such as Belgium, Denmark, Japan, the Netherlands, Norway, Spain, and the United Kingdom), and in republics in which the head of state is an elected (such as France) or unelected official (such as Germany) with varying degrees of real power.
Contrary to popular and journalistic myth, most primeministers in parliamentary systems are not appointed for a specific term of office and in effect may remain in power through a number of elections and parliaments.
In many cases, though commonly used, "primeminister" is not the official title of the office-holder; the Spanish primeminister is the President of the Government (Presidente del Gobierno).
A primeminister is the chief member of the cabinet in a parliamentary system of government, or alternatively an official in a presidential system or semi-presidential system whose duty is to execute the directives of the President and manage the civil service.
PrimeMinisters can be found in both constitutional monarchies (as is the case in the United Kingdom and Australia), and in republics, where the head of state is an elected or unelected official with varying degrees of real power.
The PrimeMinister shall be appointed by the President of the Republic after consultation and with the parties represented in the Assembly of the Republic, due regard being had to the [general] election results.