I posted this in a thread elsewhere when someone was asking a questions about the term, and it's something that's always bugged me that they use in the UFC. but it seems a LOT of people misunderstand what it means. for one, there really is no such thing as a 'disputed' champion in the UFC and 'undisputed' is a silly claim when used anywhere in the UFC since there are no other orgs that compete with the UFC (holding co-promoted fights) undisputed champion is a term for boxing, and it means nothing about a interim champ. It refers to other orgs. an undisputed champ has won the belt at least two of the organizations WBA, WBC, WBO, and IBF. it's a term the WBA coined i think when it was still called the NBA (national boxing association), if a fighter had two of the four belts he was considered undisputed (or a super champ in the WBA). ironically holding a belt IN the WBA is not required for them to declare a fighter an undisputed champ. as long as he holds two or more of the same weight class belts in the other 3. Some people consider an undisputed champ as someone that holds ALL the org's belts, but I dont think that's official. (could be wrong) this is also where the term 'unification bout' came from. two belt holders from the same weight class in different orgs would fight to unify the belt. The UFC tried to use that term with the Rampage/hendo fight but that was laughable. pride was already dead. in the UFC they use it because it sounds cooler i guess. but it's completely irrelevent.