|Sound change and alternation|
Paragoge (//; from Greek: παραγωγή additional: παρα- prefix para- 'extra', ἀγωγή agogē 'bringing in') is the addition of a sound to the end of a word. Often caused by nativization, it is a type of epenthesis, most commonly vocalic epenthesis.
Paragoge is particularly common in Brazilian Portuguese, not only in loanwords but also in word derivation. It is also present in the accents of many Brazilians while speaking foreign languages such as English.
Some languages have undergone paragoge as a sound change, and modern forms are longer than the historical forms they are derived from. Italian sono 'I am', from Latin sum, is an example. Sometimes, as above, the paragogic vowel is an echo vowel, such as Proto-Oceanic *saqat "bad" > Uneapa zaɣata.