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Meaning of iotacism

i•o•ta•cism

Pronunciation: (ī-ō'tu-siz"um), [key]
— n.
  1. the conversion of other vowel sounds, esp. in Modern Greek, into (ē), the sound of iota.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.