"Repub" is an abbreviation for "republic" or "republican."

A "republic" is a form of government in which the country is considered a "public matter," and the head of state is an elected or appointed official, rather than a hereditary monarch. In a republic, the power to govern is vested in the people or their elected representatives. Countries like the United States, South Korea, Germany, and South Africa are considered republics.

"Republican" is an adjective used to describe something related to or characteristic of a republic, a political party, or an individual who supports republican principles. It can have different meanings depending on the context. The Republican Party in the United States is one of the major political parties in the country. You can also describe a person who supports the Republican Party as a Republican.  

Example sentences

Republic

  1. The United States is a federal republic with a system of democratic governance.
  2. In a republic, the citizens have the right to choose their leaders through regular elections.
  3. The ancient Roman Republic was known for its republican principles and institutions.
  4. Many countries around the world have adopted a republic as their preferred system of government.
  5. The concept of a republic emphasizes the importance of civic participation and accountability.

Republican

  1. She holds republican values and believes in the importance of individual freedoms and limited government.
  2. The republican system of government encourages citizen participation and representation.
  3. He is a member of the Republican Party, and he actively campaigns for its candidates.
  4. The country's constitution is based on a republican framework, guaranteeing civil liberties.
  5. The republican ideals of liberty and justice for all are enshrined in the nation's founding documents.

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Reference:

Definition of REPUBLIC
a government having a chief of state who is not a monarch and who in modern times is usually a president; a political unit (such as a nation) having such a form of government… See the full definition
Definition of REPUBLICAN
one that favors or supports a republican form of government; a member of a political party advocating republicanism; a member of the Democratic-Republican party or of the Republican party of the U.S.… See the full definition