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iotacism

[ahy-oh-tuh-siz-uh m]
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noun
  1. the conversion of other vowel sounds, especially in Modern Greek, into (ē), the sound of iota.
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Origin of iotacism

1650–60; < Late Latin iōtacismus < Greek iōtakismós. See iota, -ac, -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for iotacism

iotacism

noun
  1. a tendency of vowels and diphthongs, esp in Modern Greek, to acquire the pronunciation of the vowel iota ()
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012