Since it's not a homework Q, I will essay to answer. A Republican is a member of the (American, US) Republican Party in politics. And nothing more than that. You can research and read the Republican Party platform if you want, to see what they say they stand for -- and you can watch them in practice, which is to say "read the newspapers" -- to see what they actually stand for. However, that bears little more than passing resemblance to a "republican". Keep in mind what a republic is. It's a form of democratic government in which a general framework of laws and rules help to establish and determine whether specific laws should apply to the population or not. This is because even the Greeks realized over two thousand years ago that almost no form of government is more tyrannical than a "pure" democracy where the "majority rules" on everything. That would prevent minority religions, political parties and opinions, or any other 'unorthodox' beliefs or practices. It would lead to a stifling uniformity of opinion which would stagnate and wither any population. So our 'republican' rules establish the basis of freedom of opinion, thought, expression and religion, freedom to defend oneself and family and municipality, freedom of one's own domicile from 'unreasonable search and seizure', etc. You may have realized that these 'freedoms' are those enumerated in the Bill of Rights, the first ten Amendments to the US Constitution. The Ninth and Tenth Amendments, in particular, limit the powers of the government "to the articles of the Constitution, and no more" and "reserve to the people those rights which are not otherwise given to the government by the Constitution". These, of course, are totally and universally ignored -- if they are even understood -- by our "elected leaders". Almost no one is a republican in this country any more. We are the tiniest of minorities. Thanks for asking; it was a good Q.