The definition of Macedonia is a major source of confusion due to the overlapping use of the term to describe geographical, political and historical areas, languages and peoples. Ethnic groups inhabiting the area use different terminology for the same entity, or the same terminology for different entities. Geographically, no single definition of its borders or the names of its subdivisions is accepted by all scholars and ethnic groups. Demographically, it is mainly inhabited by four ethnic groups, three of which self-identify as Macedonians: One Slavic group does so at a national level, while another, Bulgarians, as well as a Greek one do so at a regional level. Linguistically, the names and origins of the languages and dialects spoken in the region are a source of controversy. Politically, the use of the name Macedonia has led to a diplomatic dispute between Greece and the Republic of Macedonia. Despite intervention from the United Nations, the dispute is still pending full resolution.