Osage phonology is quite similar to that of Kansa. However, it preserves many historical alternations that have been leveled out in Kansa; for example, Kansa *u has merged with *i, whereas it is still largely distinct in Osage.
Vowels
Basic vowels
Osage has five plain vowels: These are written.
is a high front vowel: like English i in ski.
is a high non-back rounded vowel, like California or New Zealand Englishu in dude.
is a half-open front vowel: like English e in get.
is a mid-back rounded vowel: like English o in bolt.
is an open back vowel: like English a in bra.
varies between central and front,, and frequently unrounds to. It is especially far front following a velar obstruent and when it is near a front vowel with no intervening obstruent. It most commonly conflates with following ð and n. Usually in fast speech, the /a/ is pronounced. This assimilation occurs after a stressed syllable, or at the end of a word. For example: 'cow', 'this one'.
Nasalized vowels
There are three vowels that carry this feature:. It is quite common for nasalized to become a nasal and vice versa. Non-nasalized vowels can be heard as nasalized as well. In general, vowels tend to become nasalized adjacent to another nasal vowel or consonant when there is no intervening obstruent. On the other hand, final nasal vowels tend to become oral. However, nasal vowels are always short, regardless of their position. Examples: 'girl' and 'mountain'
According to Hans Wolff , common Osage vowel clusters are:
iu for example: niuʒõ 'Neosho River'
íe for example: wíe 'I'
íĩ for example: kasíĩte 'tomorrow'
iuĩ for example: ékiuĩka 'don't'
éa for example: cʼéaðe 'I killed him'
aĩ for example: hówaĩke 'where?'
óa for example: tóa 'this one'
Vowel length is important in Osage, but it is hard to perceive and has a good deal of variation. For example, long vowels are often reduced to short ones when they are not accented. Quintero took long vowels to be the underlying form in such situations. There is not enough information to specify exactly how the accent system works in Osage, and there is still uncertainty about Osage vowel length. Oral vowels are long before non-stop consonants and in final stressed position. When they are unstressed in final position, they are always short. Lengthening of short vowels often occurs in questions. Long vowels also arise when ð is omitted between identical vowels. When e changes to a, an immediately preceding c is often replaced by t
Diphthongs
The vowel sequences and are almost certainly diphthongs. The Osage script has letters to represent each of the diphthongs.
Consonants
There are thirty-one consonant phonemes in Osage, twenty-two of which are voiceless and nine are voiced. However, Osage has a rich system of stop sounds, known as the stop series, or the stop sequence.
Stop series
The stop series can be grouped according to five categories:
Voiceless preaspirated or fortis: which may be pronounced as geminates or preaspirated. As in other Siouan languages they sometimes derive from h-C sequences, but not always.
Voiceless plain or lenis: which are tenuis, and often lightly voiced.
Postaspirated: which never appear as a surface form.
Ejective. They cannot appear as the second member of a consonant cluster. Historical *tʼ is in Osage.
Voiced: with b being the only member in this category. The only environment this sound may appear in is in the cluster. The cluster itself generally appears in the first verb form, otherwise it is somewhat infrequent..
The ejective, fortis, and lenis series of the alphabet are not distinguished in Osage orthography. Listed below is some features and phonological alternations of Osage:
occur before back vowels, before the other vowels.
The voiceless unaspirated affricate has two allophones: after ; elsewhere it is.
The glottal stop appears in clusters only after p, c, k, and it is not considered a true consonant of Osage. It is best thought of as a phonetic device used occasionally at utterance level, and it is typically to separate vowels that would otherwise contract.
has two allophones, and . occurs between vowels, elsewhere it is.
The phoneme is always voiceless.
usually has a single allophone, but in the Hominy dialect it has two allophones: initially before and elsewhere.
The cluster also depends on dialect. It is sometimes pronounced or.
In some instances, due to morphologically complex formations, is an allophone of
The dentalveolar obstruents are often fricated: the ejective always, and the other series before the front vowels. Exceptions occur due to compounding and other derivational processes. For example, from hką́ą́ce 'fruit' and oolá 'put in' is hkąącóla 'pie'. Č, hč are rare, and only found in diminutives: č only in two words, čóopa 'a little', čáahpa 'squat', and hč for hc in endearment forms of kin terms like wihčóšpa 'my grandchild'. In Hominy, šc is pronounced šč.
Osage has a simple expanded CV syllabic template: V. All consonants occur initially and medially; they never occur in final position. Consonant clusters of the type CC only occur in initial and medial positions. Furthermore, only voiceless consonants form clusters, with the exception of. The initial clusters are, excluding aspirated stops. Medial clusters may be divided into two groups:
Cluster whose first C is p, t, c, or k
Cluster whose first C is s, ʃ, x, or h
Historical phonology
The historically aspirated series *pʰ *tʰ *kʰ is seldom realized with aspiration today. Before back vowels they are, and before front vowels . Some speakers from Hominy assimilate tx to or. Đ, n, r all derive from historic *r, and l from *kr and *xr. The latter is a recent phenomenon; in the 1930s words with modern l were transcribed xth and gth. Historically *r became ð before oral vowels and n before nasal vowels, but since the nasalization has often been lost, there are minimal pairs and are now separate phonemes. Nonetheless, intervocalic ð is optionally pronounced in many words. It is also sometimes strongly palatalized intervocalically, to the point of becoming. In words with l, this is sometimes pronounced or. The former derives from historic *xl, the latter from *kð and *gð; these sequences have largely merged with simple *l. This is productive; ð in verbs may become l when prefixed with k. The r is apparently an approximant like English. Br is most common in first-person forms of verbs beginning with ð, where the 1sg agent prefix w- assimilates to before the ð, and indeed this was written bth in the 1930s. However, in rarer cases the origin of br is opaque.