Iotacism (Greek: ἰωτακισμός, iotakismos) is the process by which a number of vowels and diphthongs in Ancient Greek converged in pronunciation so they all now sound like iota ([i]) in Modern Greek. In the case of the letter eta specifically, the process is known as itacism (from the resulting pronunciation of the letter's name as [ˈita]).
Vowels and diphthongs involved
Ancient Greek had a broader range of vowels (see Ancient Greek phonology) than Modern Greek does. Eta (η) was a long open-mid front unrounded vowel /ɛː/, and upsilon (υ) was a close front rounded vowel /y/. Over the course of time, both vowels came to be pronounced like the close front unrounded vowel iota (ι) [i]. In addition, certain diphthongs merged to the same pronunciation, especially epsilon-iota (ει) and, later, upsilon-iota (υι).
In Modern Greek the letters and digraphs "ι", "η", "υ", "ει", "οι", "ηι", "υι" are all pronounced "i", [i].
Issues in textual criticism
Iotacism caused some words with originally-distinct pronunciations to be pronounced similarly, sometimes the cause of differences between manuscript readings in the New Testament. For example, the upsilon of ὑμεῖς, ὑμῶν hymeis, hymōn "you, your" (second person plural in respectively NOM, GEN) and the eta of ἡμεῖς, ἡμῶν hēmeis, hēmōn "we, our" (first person plural in respectively NOM, GEN) could be easily confused if a lector were reading to copyists in a scriptorium. As an example of a relatively minor (almost insignificant) source of variant readings, some ancient manuscripts spelled words the way they sounded, such as the 4th-century Codex Sinaiticus, which sometimes substitutes a plain iota for the epsilon-iota digraph and sometimes does the reverse.
- Greek language
- Greek alphabet
- Ancient Greek phonology
- Koine Greek phonology
- Medieval Greek
- Modern Greek phonology
- Vowel shift
- Minuscule 541 and Minuscule 543 - manuscripts with an unusual number of itacistic errors
- Jongkind, Dirk (2007). Scribal Habits of Codex Sinaiticus, Gorgias Press LLC, p. 74 ff, 93-94.
- Greenlee, J. Harold (1964). Introduction to New Testament Textual Criticism, Eerdmans, p. 64.