The word "republican" has a few different meanings and uses in English. Let's break it down in a simple way.
Adjective: In a general sense, "republican" describes something that relates to a republic, a type of government where the supreme power lies with the citizens who can vote for their leaders.
Political Context: It can also refer to anything related to the Republican Party, one of the two major political parties in the United States.
Noun: As a noun, it can refer to a person who supports a republic or a member of the Republican Party.