A prime minister is the most senior minister of cabinet in the executive branch of government, often in a parliamentary or semi-presidential system.
A semi-presidential system is a system of government in which a president exists alongside a prime minister and a cabinet, with the latter two being responsible to the legislature of a state.
A presidential system is a system of government where a head of government is also head of state and leads an executive branch that is separate from the legislative branch.
A president is the leader of a country or a division or part of a country, typically a republic, a democracy, or a dictatorship.
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In many systems, the prime minister selects and may dismiss other members of the cabinet, and allocates posts to members within the government.
Prime Minister's Questions: 25 March 2015 by UK Parliament
In most systems, the prime minister is the presiding member and chairman of the cabinet.
The chairman or chair is the highest officer of an organized group such as a board, a committee, or a deliberative assembly.
In a minority of systems, notably in semi-presidential systems of government, a prime minister is the official who is appointed to manage the civil service and execute the directives of the head of state.
The term civil service can refer to either a branch of governmental service in which individuals are employed on the basis of professional merit as proven by competitive examinations; or the body of employees in any government agency apart from the military, which is a separate extension of any national government.
A head of state or Chief of State is the highest-ranking position in a sovereign state and is vested with powers to act as the chief public representative of that state.
In parliamentary systems fashioned after the Westminster system, the prime minister is the presiding and actual head of government and head of the executive branch.
Head of government is a generic term used for either the highest or second highest official in the executive branch of a sovereign state, a federated state, or a self-governing colony who often presides over a cabinet.
A parliamentary system is a system of democratic governance of a state where the executive branch derives its democratic legitimacy from the legislature and is also held accountable to that legislature.
In such systems, the head of state or the head of state's official representative usually holds a largely ceremonial position, although often with reserve powers.
The prime minister is often, but not always, a member of the Legislature or the Lower House thereof and is expected with other ministers to ensure the passage of bills through the legislature.
A legislature is a deliberative assembly with the authority to make laws for a political entity such as a country or city.
In some monarchies the monarch may also exercise executive powers that are constitutionally vested in the crown and may be exercised without the approval of parliament.
A constitution is a set of fundamental principles or established precedents according to which a state or other organization is governed.
As well as being head of government, a prime minister may have other roles or titles—the Prime Minister of the United Kingdom, for example, is also First Lord of the Treasury and Minister for the Civil Service.
In British government, the Minister for the Civil Service is responsible for making regulations regarding Her Majesty's Civil Service, the role of which is to assist the governments of the United Kingdom in formulating and implementing policies.
The First Lord of the Treasury is the head of the commission exercising the ancient office of Lord High Treasurer in the United Kingdom, and is now always also the Prime Minister.
The Prime Minister of the United Kingdom of Great Britain and Northern Ireland is the head of Her Majesty's Government in the United Kingdom.
Prime ministers may take other ministerial posts—for example, during the Second World War, Winston Churchill was also Minister of Defence, and in the current cabinet of Israel, Benjamin Netanyahu also serves as Minister of Communications, Foreign Affairs, Regional Cooperation, Economy and Interior
The title Defence Minister, Minister for Defence, Secretary of Defense, Secretary of State for Defence, Secretary of National Defense or some similar variation, is assigned to the person in a cabinet position in charge of a Ministry of Defence, which regulates the armed forces in sovereign states.
Sir Winston Leonard Spencer-Churchill, KG, OM, CH, TD, PC, DL, FRS, RA was a British statesman who was the Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955.
Israel, officially known as the State of Israel, is a country in the Middle East, on the southeastern shore of the Mediterranean Sea and the northern shore of the Red Sea.