The Elgeyo language, or Kalenjin proper, are a dialect cluster of the Kalenjin branch of the Nilotic language family.

In Kenya, where speakers make up 18% of the population, the name Kalenjin, a Elgeyo expression meaning "I say (to you)", gained prominence in the late 1940s and the early 1950s, when several Kalenjin-speaking peoples united under it. This ethnic consolidation created a major ethnic group in Kenya, and also involved a standardization of the Kenyan Kalenjin dialects. However, since outside Kenya the name Kalenjin has been extended to related languages such as Okiek of Tanzania and Elgon languages of Uganda, it is common in linguistic literature to refer to the languages of the Kenyan Kalenjin peoples as Elgeyo, after the principal variety.

Varieties
The Kenyan conception of Kalenjin is an inclusive term for different dialects spoken in the north Rift region of Kenya. 

Nandi
Kipsigis
Markweta
 Naandi (Cemual) (Kenya)
Terik
 Keiyo (Kenya)
 (North) Tugen (Kenya)

Phonology

Vowels
Kalenjin has a simple five-vowel inventory {a, e, i, o, u}, which is then expanded by the presence of a contrastive [+/-ATR feature], as well as a phonemic vowel length distinction. In (at least) Kipsigis (Toweett 1979) and Nandi (Creider 1989), all five vowels have both [+ATR], and [-ATR] counterparts, but the contrast is neutralized for the vowel [a] in Tugen (Jerono 2012). The neutralization of the [+/-ATR] contrast for this specific vowel is common in other Nilotic languages of the region, such as Maasai of Kenya and Didinga of South Sudan. Kalenjin, like many other African languages, exhibits Advanced Tongue Root harmony. As a result, all vowels in a word have the same [ATR] value. In the rest of the article, Kalenjin words with [-ATR] will be spelled in italics.

It is common in the language to use [ATR] distinctions to signal grammatical functions. For example, in Kipsigis, the word for ‘bird’ tàríit with a [-ATR] feature on the vowels forms its plural by changing the value of the [ATR] feature to [+ATR] for all its vowels.

Similarly, vowel length is important for certain grammatical distinctions. For example, perfect aspect in the past is signaled through lengthening of the vowel of the subject agreement prefix. Therefore, the only difference between simple and perfect aspect in the past is that the subject agreement prefix is short in the former, but long in the latter.

Consonants
The following table shows the consonant phonemes of the language:

Voicing is not phonemic for consonants, but the velar and bilabial stops [k] and [p] are voiced intervocalically, and in fast speech there is sometimes lenition of these consonants. The alveolar stop [t], though, has no voiced allophone.

All nasals apart from [m] assimilate for place to the following consonant.

Tone
Kalenjin is a tonal language. Tone is used both for lexical distinctions and to signal grammatical functions. For example, nominative case is marked with a special tonal pattern on the noun, while certain singular-plural distinctions in nouns and adjectives are signaled exclusively through tone.

Morphology

Nouns
Nouns inflect for case (nominative vs. non-nominative) and number (singular-plural). Case is tonal and is very regular, while number formation is quite irregular, with plural being signaled in a variety of different ways, including various plural suffixes, changes in the [ATR] specification of the vowels of the stem, or changes in the tonal pattern of the stem.

Moreover, each noun in the language has two different forms, called “primary” and “secondary” forms in the literature. For example, the primary form of the word for ‘bird’ in Kipsigis is tàríit, while its secondary form is tàrìityét. Nouns have primary and secondary forms in both the singular and plural number. The semantic difference between these two forms is currently not well understood. Hollis (1909) characterized the primary and secondary forms as indefinite and definite forms of the noun respectively, but this is not the correct treatment of these forms according to Toweett (1979) and Creider (1989). The former author refers to the primary form as an ‘inclusive’ form, and to the secondary one as an ‘exclusive’ form, while the latter author simply explains that it is not clear what the correct characterization of these forms is. The language has no overt articles and it seems like these two forms are related to definiteness and/or specificity in some way.

Derivational and inflectional affixes associated with nouns are always suffixes, with the exception of the prefixes kip – and che:p -, which denote male and female gender respectively. Gender is not expressed in all nouns, and does not participate in agreement.

Verbs
The verbal morphology of Kalenjin is extremely rich. Moreover, nouns and adjectives follow the verbal inflection paradigm when they are predicates.

Kalenjin verbs show a distinction between past and non-past tense, with three degrees of past being distinguished (based on distance from the present). Moreover, there is a difference between perfective and imperfective aspect, and within each one of these aspects there is a further distinction between simple and perfect aspect. In the non-past only, the perfect aspect also shows a distinction for simultaneous versus non-simultaneous actions.

The verb agrees with both the subject and the object in person and number. The order of morphemes is that of tense – subject agreement – (aspect) – stem – (aspect), with a lot of aspectual work being done by changes in the tonal pattern and/or vowels of the subject agreement prefix and/or the verbal stem.

Finally, there is a series of suffixes that can be attached to the verb to change its argument structure or add extra meaning. Toweett (1979:129) gives for Kipsigis the following list of verbal suffixes and other phonological changes that target verbal meaning:

–tʃi: applicative morpheme (it introduces and applied argument, such as a recipient or a beneficiary)
tonal and/or vowel change of the stem: the action is towards the speaker
–aan: action and movement towards the speaker
–ta: action is ‘off’ the speaker
–ak: used for dispositional middles (and possibly other middles and/or some anticausatives)
–: there are two events of what the verb denotes which take place simultaneously
Reduplication of the stem (with a vowel intervening between the two occurrences of the stem): the action is repeated several times 
–iis/-sa: antipassive
-een: instrumental (it introduces an instrument)
-ya: there are two or more agents involved in the event denoted by the verb
-kee: reflexive or reciprocal 
: comitative

The above suffixes show different behavior with respect to ATR harmony (some take the ATR value of the vowels of the stem, while others change the ATR value of the vowels of the stem). The above suffixes can co-occur on the same verb, yielding complex meanings.

Syntax

Word Order
The predominant word order in the language is Verb – Subject – Object (VSO), a common word order in Nilotic. An example of a simple VSO sentence in Nandi can be seen in (1).

The order in sentences with nominal or adjectival predicates is Predicate – Subject, as can be seen in (2) and (3).

For locative predicates, a special locative copula is used, in which case the order is Verb-Subject-Locative predicate.

In the presence of an indirect object, the order is Verb – Subject – Indirect Object – Direct Object.

VP adverbs, such as always, are usually placed after the direct object in Kalenjin.

Finally, Kalenjin is unusual among verb-initial languages, in expressing possession with a transitive verb HAVE. Other verb-initial languages of the Nilotic language family, such as Maasai, also express possession with the use of a transitive verb HAVE.

Case
Kalenjin is a marked nominative language: nominative case is the only case that is marked in the language, while all other cases (accusative, genitive, dative etc.) are left unmarked. Nominative case is marked through tone only.

Negation
Negation is expressed with the prefix ma-/maa-, which attaches to the verb. It precedes the subject agreement prefix, but it follows the tense prefixes.

Topicalization
There are two strategies for topicalization in the language, according to Creider (1989). In the unmarked case, a topicalized subject appears at the end of the sentence, retaining its nominative case marking. In the marked case, the topicalized element appears at the beginning of the sentence and is followed by the topic marker kò. In this case, if the topicalized element is a subject, it loses its nominative case.

Interrogative sentences
Yes–no questions are formed by attaching the question particle –í to the last word of a sentence.

There are three ways of forming wh-questions in Kalenjin. In the first one, the wh-word remains in situ (and retains any case marking it has). In the second one, the wh-word appears in topic position (it is followed by the topic marker kó and it loses its nominative case marking if it is a subject). The third strategy is only possible with predicative sentences, in which case the predicate appears in topic position, with the wh-word remaining in situ. The three strategies for a predicative sentence are illustrated in (7-9) below for Nandi (Creider 1989: 143).

The Lord's Prayer in Kalenjin

References

 Creider, Chet A., and Jane Tapsubei Creider. 1989. A Grammar of Nandi. 
 Hollis, Alfred Claud. 1909. Nandi: Their Language and FolkLore. Negro Universities Press.
 Jerono, Prisca. 2012. Tugen Word Order. A Minimalist Program. Unpublished PhD. Dissertation: University of Nairobi.
 Rottland, Franz. 1982. Die Südnilotischen Sprachen: Beschreibung, Vergelichung und Rekonstruktion (Kölner Beiträge zur Afrikanistik vol. 7). Berlin: Dietrich Reimer.
 Toweett, Taaitta. 1979. A Study of Kalenjin linguistics. Kenya Literature Bureau.

External links
 Kalenjin–English Dictionary
 Kalenjin Word of the Day
 A Kalenjin website
 PanAfrican L10n page on Kalenjin

Languages of Kenya
Kalenjin languages
Verb–subject–object languages