Where does “iotacism” come from?

iotacism (English) comes from English -ism, from Latin -ismus, from Ancient Greek -ισμός, from Ancient Greek -μός, from Proto-Indo-European -mós — Creates action/result nouns from verb stems.

iotacism (English): Pronunciation of another vowel or diphthong as [i], or a vowel shift resulting in such pronunciation, especially in Greek

Definitions

  1. Pronunciation of another vowel or diphthong as [i], or a vowel shift resulting in such pronunciation, especially in Greek

Ancestry of “iotacism”, step by step

StepLanguageWordMeaning
1English-ismUsed to form nouns of action or process or result...
2Latin-ismus-ism
3Ancient Greek-ισμόςForms abstract nouns
4Ancient Greek-μόςForms abstract nouns
5Proto-Indo-European-mósCreates action/result nouns from verb stems
Every word from Proto-Indo-European -mós →Every word from English -ism →Every word from Ancient Greek -μός →