Rundi

Mutually intelligible varieties of essentially the same language. Rundi is spoken in Burundi; Kinyarwanda in Rwanda. They share grammar, vocabulary, and core phonology with minor differences in pronunciation and lexicon. Most linguists treat them as standardized national varieties of a single Rwanda-Rundi language. The two terms reflect national-political identification rather than substantial linguistic divergence.

Like Rwanda, Burundi is unusual in Africa in that almost the entire population speaks the same language as a first language, including the country's traditional ethnic groups (Hutu, Tutsi, Twa). This linguistic unity made Rundi the natural national language alongside French (a colonial heritage language) and English (added more recently). Swahili has gained increasing official recognition as well.

Yes — Rundi distinguishes high and low tones lexically and grammatically. Tone shapes word meaning and signals grammatical distinctions, and tone shifts systematically across grammatical contexts. Tone is rarely marked in standard orthography, which means learners often miss tonal contrasts at first and have to listen carefully to internalize them.

Burundi almost universally, with around 11 million speakers. Substantial Rundi-speaking communities live in eastern Democratic Republic of the Congo, southwestern Tanzania, and southwestern Uganda — often called Banyarundi. The Burundian diaspora extends to Belgium, France, Canada, and the United States.

Like Kinyarwanda and other Bantu languages, Rundi distributes nouns across sixteen classes marked by prefixes that drive agreement throughout the sentence. Verbs, adjectives, and pronouns all agree with the noun's class. Classes correlate loosely with semantic categories (humans, plants, things, abstracts, locations) but many class assignments are conventional rather than predictable from meaning.