Main Difference
The main difference between Commonwealth and Republic is that the Commonwealth is a term for a political community founded for the common good and Republic is a form of government where head of state is elected.
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Commonwealth
Commonwealth is a traditional English term for a political community founded for the common good. Historically it has sometimes been synonymous with “republic”. The noun “commonwealth”, meaning “public welfare general good or advantage” dates from the 15th century. Originally a phrase (the common-wealth or the common weal – echoed in the modern synonym “public weal”) it comes from the old meaning of “wealth”, which is “well-being”, and is itself a loose translation of the Latin res publica (republic). The term literally meant “common well-being”. In the 17th century, the definition of “commonwealth” expanded from its original sense of “public welfare” or “commonweal” to mean “a state in which the supreme power is vested in the people; a republic or democratic state”.
The term evolved to become a title to a number of political entities. Three countries – Australia, the Bahamas, and Dominica – have the official title “Commonwealth”, as do four U.S. states and two U.S. territories. Since the early 20th century, the term has been used to name some fraternal associations of nations, most notably the Commonwealth of Nations, an organization primarily of former territories of the British Empire, which is often referred to as simply “the Commonwealth”.
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Republic
A republic (Latin: res publica) is a form of government in which the country is considered a “public matter”, not the private concern or property of the rulers. The primary positions of power within a republic are not inherited, but are attained through democracy, oligarchy or autocracy. It is a form of government under which the head of state is not a hereditary monarch.In the context of American constitutional law, the definition of republic refers specifically to a form of government in which elected individuals represent the citizen body and exercise power according to the rule of law under a constitution, including separation of powers with an elected head of state, referred to as a constitutional republic or representative democracy.As of 2017, 159 of the world’s 206 sovereign states use the word “republic” as part of their official names – not all of these are republics in the sense of having elected governments, nor is the word “republic” used in the names of all nations with elected governments. While heads of state often tend to claim that they rule only by the “consent of the governed”, elections in some countries have been found to be held more for the purpose of “show” than for the actual purpose of in reality providing citizens with any genuine ability to choose their own leaders.The word republic comes from the Latin term res publica, which literally means “public thing,” “public matter,” or “public affair” and was used to refer to the state as a whole. The term developed its modern meaning in reference to the constitution of the ancient Roman Republic, lasting from the overthrow of the kings in 509 B.C. to the establishment of the Empire in 27 B.C. This constitution was characterized by a Senate composed of wealthy aristocrats and wielding significant influence; several popular assemblies of all free citizens, possessing the power to elect magistrates and pass laws; and a series of magistracies with varying types of civil and political authority.
Most often a republic is a single sovereign state, but there are also sub-sovereign state entities that are referred to as republics, or that have governments that are described as “republican” in nature. For instance, Article IV of the United States Constitution “guarantee[s] to every State in this Union a Republican form of Government”. In contrast, the former Soviet Union, which described itself as being a group of “Republics” and also as a “federal multinational state composed of 15 republics”, was widely viewed as being a totalitarian form of government and not a genuine republic, since its electoral system was structured so as to automatically guarantee the election of government-sponsored candidates.
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Commonwealth (noun)
The well-being of a community.
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Commonwealth (noun)
The entirety of a (secular) society, a polity, a state.
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Commonwealth (noun)
Republic. Often capitalized, as Commonwealth.
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Republic (noun)
A state where sovereignty rests with the people or their representatives, rather than with a monarch or emperor; a country with no monarchy.
“The United States is a republic; the United Kingdom of Great Britain and Northern Ireland is a constitutional monarchy.”
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Republic (noun)
A state, which may or may not be a monarchy, in which the branches of government are separate.
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Republic (noun)
One of the subdivisions constituting Russia. See oblast.
“The Republic of Udmurtia is west of the Permian Oblast.”
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Republic (noun)
a state in which supreme power is held by the people and their elected representatives, and which has an elected or nominated president rather than a monarch.
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Republic (noun)
a group with a certain equality between its members
“the community of scholars and the republic of learning”