preiotation
/ˌpriːʌɪə(ʊ)ˈteɪʃn/ /ˌpriːjɒˈteɪʃn/(also prëiotation, prejotation) Linguistics
noun
The development or occurrence of a palatal glide before a vowel, especially (in Slavonic languages) one having the effect of palatalizing or softening a preceding consonant within the same word.
Origin
Late 19th century; earliest use found in Augustus Henry Keane (1833–1912). From pre- + iota + -ation.