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Webster 1913 Edition

Noun.

[Gr. [GREEK] the letter [GREEK], [GREEK]. Cf.

(Greek Gram.)

The pronunciation of the Greek η (eta) like the Italian e long, that is like a in the English word ate. See

etacism ‎(usually uncountable, plural etacisms)

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