Republican (noun)

1. A member or supporter of a republic, especially a supporter of the Republican Party in the United States.
2. A person who believes in the principles of a republic, such as the protection of individual rights and the restriction of the power of government.

Origin:

Late 16th century: from latin republicanus, from res publica "public matter".

Examples:

1. He is a republican and believes in small government.
2. The United States is a republic and its citizens are republicans.
3. The republican party is one of two major political parties in the United States.
4. The republican candidate lost the election.
5. The Roman Republic was a republic of ancient Rome.