/ Dictionary / Index E eta: Meaning and Definition of Find definitions for: e•ta Pronunciation: (ā'tu, ē'tu), [key] — n. the seventh letter of the Greek alphabet (H, &eegr;). the vowel sound represented by this letter. E.T.A. Pronunciation: [key] estimated time of arrival. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eta (Thesaurus) et Eta Aquarids Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language