An echo vowel, also known as a synharmonic vowel, is a paragogic vowel that repeats the final vowel in a word in speech. For example, in Chumash language, when a word ends with a glottal stop and comes at the end of an intonation unit, the final vowel is repeated after the glottal stop but is whispered and faint, as in for "arrow" (written ya).
In Rukai language, an Austronesian language, vowels are pronounced as full vowels but are predictable and disappear when they are under reduplication or when a suffix beginning with /a/ is added to the word:
| +Rukai echo vowels and phonemic vowels ! !! Agent focus !! suffix !! reduplication |
| don't drink |
| don't eat |
Similarly, in the related Uneapa language, echo vowels are added after a Proto-Oceanic final consonant, such as *Rumaq "house" > rumaka.
The Makassaric languages also occurs the echo vowels with stems ending in final /r/, /l/ or /s/. E.g. /botol/ "bottle" is realized as bótolo in Selayar language and Coastal Konjo, and as bótoloʔ in Makassarese (the latter regularly adds a glottal stop to the echo vowel). This echo vowel is dropped if a suffix is added, but retained if followed by an enclitic.
| + !Language !stem !base !with suffix !with enclitic | ||||
| Makassar | /lammor-/ | lámmoroʔ 'cheap' | /lammor-/ + /-i/ lammóri 'cheapen' | /lammoroʔ/ + /=i/ lámmoroki 'it's cheap' |
| /lambus-/ | lámbusuʔ 'straight' | /lambus-/ + /-i/ lambúsi 'straighten up' | /lambusuʔ/ + /=i/ lámbusuki 'it's straight' | |
| /lambusuʔ/ + /=aʔ/ lámbusukaʔ 'i am straight' | ||||
| Selayar | /lambus-/ | lámbusu 'straight' | /lambus-/ + /-i/ lambúsi 'straighten up' | /lambusu/ + /=i/ lámbusui 'it's straight' |
| /lambusu/ + /=a/ lámbusua 'i am straight' |
In Ainu, some writers write final /r/ with a subscript kana for ra, re, ri, ro or ru, depending on the preceding vowel, but others use a subscript ru in all cases.
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