Definition of "Republican" :

noun: a tributary of the Kansas River that flows from eastern Colorado eastward through Nebraska and Kansas

noun: an advocate of a republic (usually in opposition to a monarchy)

noun: a member of the Republican Party

adjective: having the supreme power lying in the body of citizens entitled to vote for officers and representatives responsible to them or characteristic of such government

"The United States shall guarantee to every state in this union a republican form of government."

adjective: relating to or belonging to the Republican Party

"A Republican senator."