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Which language serves as the standard medium of communication across Burundi?

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The standard medium of communication throughout Burundi is Rundi (also known as Kirundi).1

While both Rundi and French serve as the official languages of the country, Rundi is unique in that it is spoken by both the Hutu and Tutsi populations, providing a level of linguistic homogeneity that is rare in sub-Saharan Africa. Additionally, Swahili is widely used as a language of trade, particularly in the city of Bujumbura.21