n. 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.