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Northern Sotho is a language of the Bantu family within the Niger-Congo language phylum. Northern Sotho is specifically found within the Sotho languages branch of Zone S (S.30). Thus, this language is most closely related to Tswana (Setswana) and Sotho (Sesotho/Southern Sotho).
Northern Sotho is often, but erroneously, referred to as Sepedi, since for some years after the new South African constitution appeared, Pedi (or Sepedi) was the name used for Northern Sotho. There is thus some confusion as to which name to use.
The name "Pedi" is not, as some believe, synonymous with "Northern Sotho"; the official Northern Sotho language is intended to encompass approximately 30 closely related dialects, of which Pedi is but one. The name "Pedi" thus refers specifically to the language of the Pedi people, while Northern Sotho refers to the official language, which is a much broader category than merely Pedi. (Thus if speaking to a Pedi-speaker, it is not incorrect to say "Pedi", but if speaking about the official language, it is "Northern Sotho" or "Sesotho sa Leboa"). "Pedi" also refers to a ruling group which established its dominance over other groups in the eighteenth century, and to the culture and lifestyle of that group and of those over whom it ruled (see below).