The noun class system is the heart of Swahili grammar and the single feature that most distinguishes Bantu languages from the Indo-European languages most English-speaking learners have met before. Where English has at most two or three noun categories (mass vs. count, animate vs. inanimate), and where languages like Spanish or German have two or three grammatical genders, Swahili has what are traditionally counted as eighteen noun classes, typically presented as nine pairs (singular + plural) plus a handful of non-paired classes for locatives, infinitives, and abstract notions.
Every noun in Swahili belongs to a class. The class is marked by a prefix on the noun itself, and - crucially - that class determines agreement on adjectives, verbs, possessives, demonstratives, numerals, and relative pronouns. A sentence like "Kitabu kizuri kimoja kile changu kimeanguka" (That one nice book of mine has fallen) shows the Ki- prefix of the Ki-/Vi- class repeated on every agreeing element: kitabu (book), kizuri (nice), kimoja (one), kile (that), changu (mine), kimeanguka (has fallen). This is called concordial agreement, and mastering it is the central project of Swahili grammar.
This reference covers all the major noun classes, what kinds of meanings each class typically carries, the prefixes used on the noun itself, and the agreement prefixes used on adjectives and verbs. Worked examples show how a single adjective or verb stem changes form to match the class of the noun. Special attention is given to the cases where real-world meaning and class membership do not line up neatly, which is frequent in a system where class membership has been inherited from Proto-Bantu and shaped over centuries.
What a Noun Class Is
A noun class is a category that groups nouns together based on shared grammatical behavior. In Bantu linguistics, each class is traditionally numbered 1 through 18 (not all numbers are used in every language). Each class has:
- a characteristic prefix on the noun (for example, m- for class 1 humans)
- a characteristic agreement prefix on adjectives
- a characteristic agreement prefix on verbs (the subject prefix)
- a characteristic possessive and demonstrative form
Classes typically pair up: class 1 (singular) pairs with class 2 (plural), class 3 with 4, class 5 with 6, and so on. Each pair is often called by its singular-plural prefixes together, for example "M-/Wa- class" for classes 1 and 2.
Memory aid: Think of a noun class as an enormous, interlocking chain. You pick one noun, and every word that describes or refers to that noun is forced to wear the same chain-links (prefixes) for grammatical harmony.
The Full Noun Class Table
The table below summarizes the nine main pairs plus the locative and infinitive classes. Prefixes vary slightly before vowels and before certain consonants, but the standard forms are shown.
| Class | Noun Prefix | Adjective Prefix | Verb Subject Prefix | Typical Meaning | Example |
|---|---|---|---|---|---|
| 1 | m- / mw- | m- / mw- | a- | singular human | mtu (person) |
| 2 | wa- / w- | wa- | wa- | plural human | watu (people) |
| 3 | m- / mw- | m- / mw- | u- | singular plants, trees, body parts | mti (tree) |
| 4 | mi- | mi- | i- | plural of class 3 | miti (trees) |
| 5 | (ji-) / various | - / ji- | li- | singular fruits, augmentatives, various | jicho (eye), tunda (fruit) |
| 6 | ma- | ma- | ya- | plural of class 5, liquids | macho (eyes), maji (water) |
| 7 | ki- / ch- | ki- / ch- | ki- | singular objects, languages, diminutives | kitabu (book), Kiswahili |
| 8 | vi- / vy- | vi- / vy- | vi- | plural of class 7 | vitabu (books) |
| 9 | N- (n, m, ny, or zero) | - / ny- | i- | singular animals and many concrete nouns | nyumba (house), ng'ombe (cow) |
| 10 | N- (same as class 9) | - / ny- | zi- | plural of class 9 | nyumba (houses), ng'ombe (cows) |
| 11 | u- / w- | m- / mw- | u- | singular abstract nouns, long objects | ukuta (wall), uzuri (beauty) |
| (10) | N- | - | zi- | plural of class 11 (merges with 10) | kuta (walls) |
| 14 | u- | m- | u- | abstract nouns (no plural) | uhuru (freedom) |
| 15 | ku- | - | ku- | infinitives and verbal nouns | kusoma (to read / reading) |
| 16 | pa- | pa- | pa- | specific location | pahali pazuri (a nice place) |
| 17 | ku- | ku- | ku- | general location or direction | kule (over there) |
| 18 | mu- / m- | m- | m- | inside location | ndani mna (inside there is) |
Note that classes 12 and 13 (diminutives with ka-/tu-) are used in some Bantu languages but have merged into the Ki-/Vi- diminutive pattern in Swahili.
Class 1 and 2: M-/Wa- (Humans)
This is the class for human beings - people, relatives, professions, nationalities.
| Singular | Plural | Meaning |
|---|---|---|
| mtu | watu | person / people |
| mtoto | watoto | child / children |
| mwalimu | walimu | teacher / teachers |
| mwanafunzi | wanafunzi | student / students |
| Mkenya | Wakenya | Kenyan / Kenyans |
| rafiki | marafiki | friend / friends (irregular) |
When the stem starts with a vowel, m- becomes mw- (mwalimu, mwana). When the stem starts with a consonant, m- stays plain (mtu, mtoto).
Agreement example: "Mtoto mzuri anacheza" (The good child is playing). Adjective: m-zuri. Verb: a-na-cheza (class 1 subject a-).
Plural: "Watoto wazuri wanacheza" (The good children are playing). Adjective: wa-zuri. Verb: wa-na-cheza.
Class 3 and 4: M-/Mi- (Trees, Plants, Body Parts)
This class confuses learners because the singular prefix looks identical to class 1. The critical difference is that class 3 is non-human. A class 3 noun takes u- as its verb prefix, not a-.
| Singular | Plural | Meaning |
|---|---|---|
| mti | miti | tree / trees |
| mlango | milango | door / doors |
| mkono | mikono | hand / arm, hands / arms |
| mchezo | michezo | game / games |
| mwaka | miaka | year / years |
Agreement example: "Mti mkubwa umeanguka" (The big tree has fallen). Adjective: m-kubwa. Verb: u-me-anguka (class 3 subject u-).
Plural: "Miti mikubwa imeanguka" (Big trees have fallen). Adjective: mi-kubwa. Verb: i-me-anguka (class 4 subject i-).
Key insight: Classes 1 and 3 share the noun prefix m-, but their agreement prefixes differ. Class 1 verb: a-. Class 3 verb: u-. This prevents ambiguity: "mtu analima" (a person is cultivating) vs. "mti unalima"... which is impossible because trees don't cultivate, but "mti umekua" (the tree has grown) shows the u- agreement.
Class 5 and 6: Ji-/Ma- (Fruits, Augmentatives, Liquids)
Class 5 is the most irregular: many nouns take the explicit ji- prefix, some take a zero prefix, and many loanwords simply sit in this class because there is nowhere else for them to go. The pattern is clearer in the plural (class 6, ma-).
| Singular | Plural | Meaning |
|---|---|---|
| jicho | macho | eye / eyes |
| jina | majina | name / names |
| jiwe | mawe | stone / stones |
| tunda | matunda | fruit / fruits |
| gari | magari | car / cars |
| yai | mayai | egg / eggs |
| neno | maneno | word / words |
Class 6 also contains a small group of mass nouns that exist only in the plural form: maji (water), maziwa (milk), mafuta (oil), damu (blood - exceptionally).
Agreement example: "Jina lake ni zuri" (His/her name is good). Verb: li- becomes l- before vowel: "Jina linasomeka" (The name is readable) uses li-.
Plural: "Majina yao ni mazuri" (Their names are good). Adjective: ma-zuri. Verb ya-.
Class 7 and 8: Ki-/Vi- (Things, Languages, Diminutives)
Ki-/Vi- is the most recognizable noun class, containing "things" - tools, objects, household items - as well as all language names.
| Singular | Plural | Meaning |
|---|---|---|
| kitabu | vitabu | book / books |
| kiti | viti | chair / chairs |
| kisu | visu | knife / knives |
| chakula | vyakula | food / foods (k becomes ch before vowel) |
| Kiswahili | - | Swahili language |
| Kiingereza | - | English language |
Before a vowel, ki- becomes ch- and vi- becomes vy-. Hence "kitu" (thing) but "chakula" (food), "vitu" (things) but "vyakula" (foods).
The Ki-/Vi- class is also the diminutive class. Add ki- to almost any noun and it becomes "a small version of that noun," often with an affectionate or slightly dismissive tone. Mtoto (child) -> kitoto (a little child, often a baby or toddler affectionately). Nyumba (house) -> kijumba (a little house, a hut).
Agreement example: "Kitabu kizuri kinasomeka" (A good book is readable). All Ki-.
Plural: "Vitabu vizuri vinasomeka" (Good books are readable). All Vi-.
Class 9 and 10: N- (Animals and Concrete Nouns)
The N- class is the most common class in everyday speech and contains most animals, many foreign loanwords, and a large miscellaneous group of concrete objects. Its defining feature is that singular and plural are identical: there is no visible plural marker.
| Singular | Plural | Meaning |
|---|---|---|
| nyumba | nyumba | house / houses |
| ng'ombe | ng'ombe | cow / cows |
| simba | simba | lion / lions |
| habari | habari | news (grammatically both) |
| kalamu | kalamu | pen / pens |
| meza | meza | table / tables |
| picha | picha | picture / pictures |
The N- prefix itself is often invisible. It appears as n before d, t, z, j (ndege, nta, nzi, njia), as m before b, v, p, f (mbuzi, mvua), as ny before a vowel (nyumba, nyota), or disappears entirely before most other consonants (kalamu, meza).
Agreement example: "Nyumba nzuri inaonekana" (A good house is visible). Adjective: n-zuri. Verb: i-na-onekana (class 9 subject i-).
Plural: "Nyumba nzuri zinaonekana" (Good houses are visible). Verb: zi-na-onekana (class 10 subject zi-). The noun looks identical; only the verb distinguishes singular from plural.
Class 11 and 14: U- (Abstract Nouns)
Class 11 contains long thin objects (threads, walls) and abstract nouns (beauty, truth, freedom). Class 14 also uses u- and is functionally similar for abstract nouns. Many Swahili grammars collapse them into a single "u- class."
| Noun | Meaning |
|---|---|
| uhuru | freedom |
| upendo | love |
| ubaya | badness |
| uzuri | beauty / goodness |
| uzi | thread |
| ukuta | wall (plural: kuta, class 10) |
| ulimi | tongue (plural: ndimi, class 10) |
Abstract nouns in u- typically have no plural. Concrete nouns in u- pluralize in class 10, often with N- prefix effects.
Agreement example: "Uhuru wetu ni mkubwa" (Our freedom is great). Adjective: m-kubwa (class 11 takes m- like class 1 for adjectives).
Class 15: Ku- (Infinitives)
The infinitive / verbal noun class contains the dictionary form of every verb.
- kusoma (to read, reading)
- kulima (to cultivate, cultivating)
- kuwa (to be)
- kula (to eat)
Because infinitives can function as nouns ("Reading is good"), they take class 15 agreement: "Kusoma ni kuzuri" (Reading is good). Both ku- marks the infinitive and ku-zuri shows class 15 agreement.
Classes 16, 17, 18: Locatives
These three classes handle location. They are not prefixes on new nouns but suffixes that turn other nouns into locative expressions.
Adding -ni to any noun creates a locative form that then takes class 16, 17, or 18 agreement depending on the kind of location meant.
- nyumba (house) -> nyumbani (at home, at the house)
- shule (school) -> shuleni (at school)
- meza (table) -> mezani (on the table)
Agreement: class 16 pa- for specific location, class 17 ku- for general or directional location, class 18 m-/mu- for inside.
"Nyumbani pana watu" (At the house there are people - specific, pa-). "Nyumbani kuna watu" (At the house - generally - there are people, ku-). "Nyumbani mna watu" (Inside the house there are people, m-).
Agreement in Practice: One Sentence, Four Classes
The power of the noun class system becomes clear when you see the same adjective ("good" = -zuri) take different prefixes with different classes.
| Class | Example | Agreement |
|---|---|---|
| 1 | mtu mzuri | good person |
| 2 | watu wazuri | good people |
| 3 | mti mzuri | good tree |
| 4 | miti mizuri | good trees |
| 5 | jicho zuri | good eye |
| 6 | macho mazuri | good eyes |
| 7 | kitabu kizuri | good book |
| 8 | vitabu vizuri | good books |
| 9 | nyumba nzuri | good house |
| 10 | nyumba nzuri | good houses (verb disambiguates) |
| 11 | uzuri mzuri | good beauty (rare, mostly abstract) |
| 15 | kusoma kuzuri | good reading |
Common Mistakes English Speakers Make
1. Treating class 1 and class 3 as the same class. Both singulars start with m-, but they agree differently. "Mtu mzuri analima" (a good person is cultivating) uses a-; "Mti mzuri unakua" (a good tree is growing) uses u-. Class membership is not negotiable.
2. Forgetting that class 9/10 singular and plural look identical. Learners sometimes assume "nyumba" only means "house," but it can also mean "houses." The verb tells you: i-na-onekana (singular) vs. zi-na-onekana (plural).
3. Applying English plural logic. In English we add "-s" to the end of a noun to pluralize. In Swahili we change the beginning of the noun. "Mtu -> watu" is a complete prefix swap, not a suffix addition.
4. Ignoring concordial agreement. A learner might say "Watu mzuri anacheza." Every element is wrong: adjective must be wazuri, verb must be wanacheza to match the class 2 plural noun watu.
5. Assuming meaning predicts class. Ng'ombe (cow) is in class 9/10, not the human class 1/2 even though cows are animate. Rafiki (friend) is in class 9/10, not the expected human class, because it is an Arabic loanword that entered Swahili through that channel.
Quick Reference
| Pair | Meaning | Noun Prefix | Adjective Prefix | Verb Prefix |
|---|---|---|---|---|
| 1/2 | Humans | m- / wa- | m- / wa- | a- / wa- |
| 3/4 | Trees, body | m- / mi- | m- / mi- | u- / i- |
| 5/6 | Misc, liquids | (ji-) / ma- | - / ma- | li- / ya- |
| 7/8 | Things, languages | ki- / vi- | ki- / vi- | ki- / vi- |
| 9/10 | Animals, concrete | N- / N- | N- / N- | i- / zi- |
| 11 | Abstract | u- | m- | u- |
| 15 | Infinitive | ku- | - | ku- |
FAQ
How many noun classes does Swahili have?
The traditional count is 18, but many of these are not used or have merged with others. In practical Swahili, learners encounter about nine singular-plural pairs plus the locative and infinitive classes. Some textbooks simplify the count to about 15 active classes.
Do I really have to memorize which class every noun belongs to?
Yes, but there are patterns. Humans go in class 1/2. Things usually go in class 7/8. Most animals go in class 9/10. Abstract nouns go in class 11/14. Once you know about 200 nouns, the patterns become predictable for new vocabulary.
Why is "rafiki" (friend) not in the human class?
"Rafiki" is an Arabic loanword that entered Swahili through class 9/10, which accepts most loanwords. Its plural "marafiki" shows class 6 plural morphology, making it a hybrid. This is common among Arabic loanwords.
Can a noun change class?
Yes, through derivation. Moving a noun to class 7/8 (ki-/vi-) creates diminutives. Moving to class 5/6 (ji-/ma-) creates augmentatives. "Mtu" (person, class 1) becomes "kitu" (thing, class 7) and "jitu" (giant, class 5).
What makes the noun class system different from European gender?
European gender is usually a binary or ternary system with minimal semantic motivation. Swahili noun classes are numerous, retain semantic coherence in many classes (humans, trees, things, abstract), and trigger much more extensive agreement - including on verbs and numerals, not just adjectives and articles.
Is Swahili the only language with noun classes?
No. All Bantu languages - Zulu, Xhosa, Shona, Kikuyu, Lingala, and hundreds of others - have comparable systems. The system is inherited from Proto-Bantu. Swahili has simplified it somewhat (losing tone, losing some classes) but retains the core structure.
Where do new loanwords go?
Almost always class 9/10, the "catch-all" class. New English loanwords like "kompyuta" (computer) or "tikiti" (ticket) enter class 9/10 by default. This has made class 9/10 the most populous class in modern Swahili.
See Also
- Swahili Alphabet and Pronunciation
- Swahili Verb Conjugation and Tense Markers
- Swahili Adjectives and Agreement
- Swahili Pronouns: Subject, Object, Possessive
- Swahili Numbers and Counting
- Swahili Prepositions and Location
- Grammatical Cases Compared
- Language Difficulty for English Speakers
Frequently Asked Questions
How many noun classes does Swahili have?
The traditional count is 18, though many numbers are not used or have merged. Practical Swahili has about nine singular-plural pairs plus the locative and infinitive classes. Some textbooks simplify the count to about 15 active classes.
Do I really have to memorize which class every noun belongs to?
Yes, but there are patterns. Humans go in class 1/2. Things usually go in class 7/8. Most animals go in class 9/10. Abstract nouns go in class 11/14. Once you know about 200 nouns, the patterns become predictable.
Why is rafiki (friend) not in the human class?
Rafiki is an Arabic loanword that entered Swahili through class 9/10, which accepts most loanwords. Its plural marafiki shows class 6 morphology, making it a hybrid - a common pattern for Arabic loans.
Can a noun change class?
Yes, through derivation. Moving a noun to class 7/8 (ki-/vi-) creates diminutives; moving to class 5/6 (ji-/ma-) creates augmentatives. Mtu (person) becomes kitu (thing, class 7) and jitu (giant, class 5).
What makes noun classes different from European gender?
European gender is usually binary or ternary and largely arbitrary. Swahili noun classes are numerous, retain semantic coherence in many classes, and trigger far more extensive agreement, including on verbs and numerals, not just adjectives and articles.
Is Swahili the only language with noun classes?
No. All Bantu languages - Zulu, Xhosa, Shona, Kikuyu, Lingala, and hundreds of others - have comparable systems inherited from Proto-Bantu. Swahili has simplified the system somewhat but retains the core structure.
Where do new loanwords go?
Almost always class 9/10, the catch-all class. Modern loans like kompyuta (computer) and tikiti (ticket) enter class 9/10 by default, making it the most populous class in contemporary Swahili.
