Main definitions of eta in English

: eta1ETA2ETA3ETA4

eta1

noun

  • 1The seventh letter of the Greek alphabet (Η, η), transliterated as ‘e’ or ‘ē’.

    • ‘The squads had been organized into Alpha, Beta, Gamma, Delta, Epsilon, Zeta, Eta and Theta.’
    • ‘This complex contains eight different homologous subunits, alpha, beta, gamma, delta, epsilon, zeta, eta, and theta.’
    1. 1.1Astronomy followed by Latin genitive The seventh star in a constellation.
      ‘Eta Carinae’
      • ‘Researchers using NASA's Far Ultraviolet Spectroscopic Explorer satellite have made the first ever direct observation of Eta Carinae's companion star.’
      • ‘The striking picture reveals an eclectic mix of embryonic stars living in the tattered neighborhood of one of the most famous massive stars in our Milky Way galaxy, Eta Carinae.’
      • ‘That galaxy is just a little more than one degree east of Eta Piscium.’
      • ‘On the night of 10 September 1784, the English astronomer Edward Pigott noticed variations in the brightness of Eta Aquilae, a star lying in the constellation Aquila.’
      • ‘This region, about 8000 light-years from Earth, is located near to the famous explosive variable star Eta Carinae, which lies just outside the field of view toward the upper right.’

Origin

From Greek ēta.

Pronunciation

eta

/ˈiːtə/

Main definitions of eta in English

: eta1ETA2ETA3ETA4

ETA2

proper noun

  • A Basque separatist movement in Spain, founded in 1959.

Origin

Basque acronym, from Euzkadi ta Azkatasuna ‘Basque homeland and liberty’.

Pronunciation

ETA

/ˈɛtə/

Main definitions of eta in English

: eta1ETA2ETA3ETA4

ETA3

noun

  • An estimated time of arrival, in particular the time at which an aircraft or ship is expected to arrive at its destination.

Pronunciation

ETA

/ˌiːtiːˈeɪ/

Main definitions of eta in English

: eta1ETA2ETA3ETA4

ETA4

abbreviation

  • Edited to add (used in online discussions to indicate that one has modified the content of a post one has made, typically in order to add something)

    ‘ETA: sorry, didn't see your post before I posted mine, @Abc!’

Pronunciation

ETA

/ˌiːtiːˈeɪ/