\ ˈā-tə How to pronounce eta (audio) , chiefly British ˈē-tə \

Definition of eta

 (Entry 1 of 2)

: the 7th letter of the Greek alphabet — see Alphabet Table

Definition of ETA (Entry 2 of 2)

estimated time of arrival

Examples of eta in a Sentence

Recent Examples on the Web: Noun Performances will take place at the eta Creative Arts. Kt Hawbaker,, "Congo Square Theater announces 2018-19 season, opening with 'Lady Day at Emerson’s Bar and Grill'," 4 June 2018 RP2 — Nate Jones, Chicago White Sox ETA: Early July Risk: High Jones is scheduled to return soon from nerve inflammation in his elbow. Joe Pytleski, USA TODAY, "Injured pitchers provide risk/reward options for the second half," 28 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'eta.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of eta


15th century, in the meaning defined above

History and Etymology for eta


Middle English, from Late Latin, from Greek ēta, of Semitic origin; akin to Hebrew ḥēth heth

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The first known use of eta was in the 15th century

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Cite this Entry

“Eta.” Dictionary, Merriam-Webster, Accessed 9 Jul. 2020.

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More from Merriam-Webster on eta

Rhyming Dictionary: Words that rhyme with eta

Spanish Central: Translation of eta

Britannica English: Translation of eta for Arabic Speakers Encyclopedia article about eta

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