Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun In Greek, the pronunciation of certain letters, like eta and upsilon, as iota (ē) because of a regular sound change.

from The Century Dictionary.

  • noun Conversion of other vowel sounds into that of iota (English ē); specifically, in pronunciation of Greek, the practice of giving the sound of iota (ι) also to the vowels η and υ, and to the diphthongs ει, ῃ, οι, and υι indiscriminately. This is the rule in modern Greek. Also called itacism. Opposed to etacism. Compare lambdacism, rhotacism.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The frequent use of the sound of iota (that of English e in be), as among the modern Greeks; also, confusion from sounding ε, ι, η, υ, ει, etc., like ι.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A misspelling resulting from such pronunciation.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Late Latin iōtacismus, from Greek iōtakismos, from iōta, iota; see iota.]

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Examples

  • [Page 323] macism or imperfect pronunciation of g; iotacism, defective pronunciation of the gutturals; mogilalia, imperfect pronunciation of the labials, and according to some authors, as Preyer, mogilalia is made to include also the suppression of the first sound of a word.

    The Montessori Method Anne E. Montessori George 1912

  • The spelling "Lite" is incorrect and comes from iotacism.

    The Catholic Encyclopedia, Volume 9: Laprade-Mass Liturgy 1840-1916 1913

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