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The Collaborative International Dictionary

Etacism

Etacism \E"ta*cism\, n. [Gr. ? the letter ?, ?. Cf. Itacism.] (Greek Gram.) The pronunciation of the Greek [eta] (eta) like the Italian e long, that is like a in the English word ate. See Itacism.

Wiktionary

etacism

n. (context grammar English) The pronunciation of the Greek eta like the Italian long e, or the vowel in the English word (term: ate).