The Tshiluba Alphabet

Q: What is the difference between Tshiluba, Ciluba, and Luba-Kasai?

Tshiluba , Ciluba , and Luba-Kasai all refer to the same language (ISO 639-3: lua). Tshiluba is the community's own name — Tshi- is a Bantu noun-class prefix meaning "language of". Ciluba is an alternative community spelling. Luba-Kasai is the scholarly and external name, distinguishing it from other Luba languages (e.g., Kiluba/Luba-Katanga) [1] . Linguists often use "Luba-Kasai" to avoid confusion with related Luba languages in Katanga province. The people are Baluba or Bena Ciluba — communities of the Kasai basin. All three names are used interchangeably in academic and community contexts [2] .

Q: How many people speak Tshiluba?

Tshiluba is spoken by approximately 6–8 million people as a first or second language. It is the dominant language of the four Kasai provinces of the Democratic Republic of the Congo (Kasai-Central, Kasai, Kasai-Oriental, and Lomami) and functions as the primary lingua franca for inter-ethnic communication across this vast region [1] . As one of four national languages of the DRC, Tshiluba is used in government, education, and media in the Kasai region. Its status as a lingua franca means total speaker numbers (L1 + L2) significantly exceed the ethnic Baluba community alone [2] .

Q: What are prenasalized consonants in Tshiluba?

Prenasalized consonants in Tshiluba are sounds where a nasal consonant and a stop are fused into a single phoneme . For example, mb is not m + b in sequence — it is a single sound where the nasal onset and bilabial stop are produced simultaneously as one unit. The same applies to mp, nd, ng, nk, and nj [2] . This prenasalization is a defining feature of Bantu languages and is why they sound distinctive to English speakers. English has nothing equivalent — even in words like "impulse" or "combine", the nasal and stop are two separate phonemes, not fused. In Tshiluba, prenasalized consonants can appear at the beginning of words and syllables [3] .

Q: Is Tshiluba related to Swahili?

Yes — Tshiluba and Swahili are both Bantu languages, meaning they share a common ancestor: Proto-Bantu, spoken approximately 3,000–5,000 years ago in the region of present-day Cameroon and Nigeria. Both languages share the pan-Bantu ten root (dikumi vs. kumi), the five root (itanu vs. tano), and the three root (itatu vs. tatu) [3] . However, Tshiluba and Swahili belong to different Bantu subgroups and are not mutually intelligible . Swahili is an Eastern Bantu language with Arabic influence; Tshiluba is a Central Bantu language. The shared roots are inherited from Proto-Bantu rather than from contact. Both are among the four national languages of the DRC [1] .

Q: What is the tone system of Tshiluba?

Tshiluba has a two-tone system (high tone and low tone). Tone is both lexically distinctive (same consonants and vowels, different meanings with different tones) and grammatically functional (different tenses and aspects use different tonal patterns). This is typical of Bantu languages across Sub-Saharan Africa [2] . The standard written orthography of Tshiluba does not mark tones , which means that readers must rely on context and prior knowledge to determine the intended tonal pattern. Tonal analysis of Tshiluba has been carried out by missionaries and linguists since the 19th century [3] .

Q: What is the ISO 639-3 code for Tshiluba?

The ISO 639-3 code for Tshiluba (Luba-Kasai / Ciluba) is lua . This code identifies the language in international databases, linguistic archives, and language technology projects. Note that lua refers specifically to Luba-Kasai (Tshiluba) and should not be confused with Kiluba (Luba-Katanga), which has the ISO code lub [1] . Academic research on Tshiluba — including phonological analysis, corpus building, and natural language processing — has been conducted at institutions including the University of South Africa (UNISA). Tshiluba has a rich body of oral literature and proverbs that have been documented by missionaries and linguists [2] .

Q: What is the noun class system in Tshiluba?

Like all Bantu languages, Tshiluba organises nouns into noun classes marked by prefixes. Each class requires matching prefixes on adjectives, verbs, and pronouns. The prefix Tshi- (class 7, for languages and abstract concepts) appears in the language name itself — Tshi-luba means "language of the Luba people". The same prefix appears in Tshivenda (Venda language) [2] . People are marked with the Ba- prefix: Baluba (Luba people), Bakasai (people of Kasai). This Ba-/Tshi- system for people/language is characteristic of the Bantu family. Tshiluba has approximately 15 noun classes, each with its own set of agreement morphemes that give the language its intricate grammatical structure [3] .

Q: Where is Tshiluba used in public life?

As one of four national languages of the DRC , Tshiluba is used in radio and television broadcasts across the Kasai region, in primary and secondary school education, and in religious services. The DRC's national broadcaster (RTNC) produces Tshiluba-language programming, and Tshiluba-language churches and Bible translations have been central to the language's standardisation [1] . Tshiluba is the medium of instruction in Kasai primary schools alongside French. It is also used in provincial administration and in community health communications across the Kasai provinces. The University of Kananga and other Kasai-region institutions use Tshiluba in community outreach and local-language education programmes [2] .

Tshiluba at a Glance

Tshiluba (also called Ciluba or Luba-Kasai) is the Bantu lingua franca of the Kasai region of the Democratic Republic of the Congo (ISO 639-3: lua). It belongs to the Central Bantu subgroup and is spoken by approximately 6–8 million people as first or second language across the Kasai-Central, Kasai, Kasai-Oriental, and Lomami provinces ^[1]
Tshiluba is one of the four national languages of the Democratic Republic of the Congo alongside Lingala, Swahili, and Kikongo. It serves as the primary language of wider communication (lingua franca) across the DRC's four Kasai provinces and is used in commerce, education, and Protestant church services throughout the region ^[1]
The Tshiluba writing system uses the Latin alphabet with digraphs for prenasalized consonants (mb, mp, nd, ng, nk, nj) and postalveolar affricates (ch /tʃ/, sh /ʃ/). The palatal nasal ny (/ɲ/) is written as a digraph, following the pan-Bantu orthographic convention used from Swahili to Tumbuka to Tshiluba ^[2]
Tshiluba has a two-tone system (high and low) like most Bantu languages. Tone is grammatically functional — the same verb stem with different tone patterns can express different tenses, aspects, or polarities. However, tones are not marked in the standard written orthography, requiring learners to acquire tonal patterns through oral exposure ^[2]
The numeral system of Tshiluba reflects pan-Bantu patterns: -tatu (three), -tanu (five), and -kumi (ten) are cognate with Swahili tatu/tano/kumi, Zulu thathu/hlanu/ishumi, and Tumbuka vitatu/visanu/khumi. Numbers 7–9 use a "five-and-X" additive pattern (muanda mosi, muanda ibidi, muanda itatu = 7, 8, 9) ^[3]
The University of South Africa (UNISA) and other South African institutions maintain programmes in Tshiluba language and literature, given the DRC's proximity and the Tshiluba-speaking diaspora in South Africa. Tshiluba language materials are also produced by Protestant missionary organisations who have worked in the Kasai region since the 19th century ^[2]

Tshiluba Prenasalized Consonants:

[ᵐb]

[ᵐp]

[ⁿd]

[ᵑɡ]

[ᵑk]

[ⁿdʒ]

[ɲ]

[ᵐb]

Prenasalized voiced bilabial stop /ᵐb/ — a single phoneme, not two consonants; the nasal onset and the bilabial stop are fused; extremely common in Bantu languages across Sub-Saharan Africa

[ᵐp]

Prenasalized voiceless bilabial stop /ᵐp/ — nasal onset followed by the p stop as a single phoneme; a characteristic Bantu consonant cluster in Tshiluba

[ⁿd]

Prenasalized voiced alveolar stop /ⁿd/ — a single phoneme fusing nasal and alveolar stop; one of the most common prenasalized consonant types across the Bantu family

[ᵑɡ]

Prenasalized voiced velar stop /ᵑɡ/ — a single phoneme with nasal onset and velar stop; sounds like "ng" in English "finger" (as one phoneme)

[ᵑk]

Prenasalized voiceless velar stop /ᵑk/ — nasal onset before the k stop; a characteristic Bantu phoneme found in Tshiluba and many related languages

[ⁿdʒ]

Prenasalized voiced palato-alveolar affricate /ⁿdʒ/ — nasal onset fused with the j-affricate; a single phoneme in Tshiluba phonology

[ɲ]

Palatal nasal /ɲ/ — NY as in "canyon"; a single consonant despite being written as two letters; ubiquitous across the entire Bantu language family from Cameroon to South Africa

Tshiluba Vowels:

[a]

[e]

[i]

[o]

[u]

Tshiluba Consonants:

[b]

[tʃ]

[d]

[f]

[ɡ]

[h]

[dʒ]

[k]

[l]

[m]

[n]

[p]

[s]

[ʃ]

[t]

[v]

[w]

[j]

[z]

[b]

Voiced bilabial stop /b/ — B as in "bat"; distinct from the prenasalized mb

[tʃ]

Voiceless palato-alveolar affricate /tʃ/ — CH as in "church"; a digraph representing a single phoneme in Tshiluba orthography

[d]

Voiced alveolar stop /d/ — D as in "dog"; distinct from the prenasalized nd

[f]

Voiceless labiodental fricative /f/ — F as in "fun"

[ɡ]

Voiced velar stop /ɡ/ — G as in "go"; distinct from the prenasalized ng

[h]

Voiceless glottal fricative /h/ — H as in "house"

[dʒ]

Voiced palato-alveolar affricate /dʒ/ — J as in "jam"; the voiced counterpart of ch

[k]

Voiceless velar stop /k/ — K as in "kite"; Tshiluba: dikumi (ten) contains this consonant

[l]

Alveolar lateral approximant /l/ — L as in "lamp"

[m]

Bilabial nasal /m/ — M as in "mother"; in Tshiluba, m functions as a syllabic nasal and as the first element in prenasalized consonants mb and mp

[n]

Alveolar nasal /n/ — N as in "night"; also functions as a syllabic nasal and first element in prenasalized consonants

[p]

Voiceless bilabial stop /p/ — P as in "pin"; distinct from the prenasalized mp

[s]

Voiceless alveolar fricative /s/ — S as in "sun"

[ʃ]

Voiceless postalveolar fricative /ʃ/ — SH as in "shoe"; a digraph in Tshiluba orthography representing a single phoneme

[t]

Voiceless alveolar stop /t/ — T as in "top"; Tshiluba: itatu (three) contains this consonant

[v]

Voiced labiodental fricative /v/ — V as in "very"

[w]

Labio-velar approximant /w/ — W as in "water"

[j]

Palatal approximant /j/ — Y as in "yes"; common in Bantu morphological contexts

[z]

Voiced alveolar fricative /z/ — Z as in "zoo"

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[1]

One in Tshiluba — mosi

[2]

Two in Tshiluba — ibidi

[3]

Three in Tshiluba — itatu (-tatu is the pan-Bantu root for three: Swahili tatu, Zulu thathu, Tumbuka vitatu)

[4]

Four in Tshiluba — inya

[5]

Five in Tshiluba — itanu (-tanu cognate with Swahili tano, the pan-Bantu five root)

[6]

Six in Tshiluba — isambombo

[7]

Seven in Tshiluba — muanda mosi (five and one — the additive counting pattern shared across Bantu)

[8]

Eight in Tshiluba — muanda ibidi (five and two)

[9]

Nine in Tshiluba — muanda itatu (five and three)

[10]

Ten in Tshiluba — dikumi (di- is a noun-class prefix; -kumi is the pan-Bantu ten root, found in Swahili kumi, Zulu ishumi, Tumbuka khumi)

[a]

[b]

[tʃ]

[d]

[e]

[f]

[ɡ]

[h]

[i]

[dʒ]

[k]

[l]

[m]

[ᵐb]

[ᵐp]

[n]

[ⁿd]

[ᵑɡ]

[ⁿdʒ]

[ᵑk]

[ɲ]

[o]

[p]

[s]

[ʃ]

[t]

[u]

[v]

[w]

[j]

[z]

Expand All Collapse All

What is the difference between Tshiluba, Ciluba, and Luba-Kasai?

How many people speak Tshiluba?

What are prenasalized consonants in Tshiluba?

Is Tshiluba related to Swahili?

What is the tone system of Tshiluba?

What is the ISO 639-3 code for Tshiluba?

What is the noun class system in Tshiluba?

Where is Tshiluba used in public life?

References:

[1] CIA World Factbook. "Democratic Republic of the Congo — People and Society". Retrieved from CIA World Factbook — DR Congo
[2] University of South Africa (UNISA), Department of African Languages. "Tshiluba Language Studies". Retrieved from University of South Africa (UNISA) — African Languages
[3] PubMed Central (PMC), National Library of Medicine. "Tshiluba Language Research — Computational and Applied Linguistics". Retrieved from PubMed Central — Tshiluba Language Research