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Concept
Iotacism
Summary
Iotacism (ἰωτακισμός, iotakismos) or itacism is the process of vowel shift by which a number of vowels and diphthongs converged towards the pronunciation i in post-classical Greek and Modern Greek. The term "iotacism" refers to the letter iota, the original sign for i, with which these vowels came to merge. The alternative term itacism refers to the new pronunciation of the name of the letter eta as ˈita after the change.
Koine Greek phonology
Ancient Greek had a broader range of vowels (see Ancient Greek phonology) than Modern Greek has. 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. Specifically, Epsilon-iota (ει) initially became /eː/ in Classical Greek before it later raised to (ι) while, later, omicron-iota (οι) and upsilon-iota (υι) merged with upsilon (υ). As a result of eta and upsilon being affected by iotacism, so were the respective diphthongs.
In Modern Greek, the letters and digraphs ι, η, υ, ει, οι, υι (rare) are all pronounced i.
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 "ye, your" (second person plural in respectively nominative, genitive) and the eta of ἡμεῖς, ἡμῶν hēmeis, hēmōn "we, our" (first person plural in respectively nominative, genitive) could be easily confused if a lector were reading to copyists in a scriptorium. (In fact, Modern Greek had to develop a new second-person plural, εσείς, while the first-person plural's eta was opened to epsilon, εμείς, as a result of apparent attempts to prevent it sounding like the old second-person plural.
Official source
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