Definition of epsilon in English:


Line breaks: ep¦si|lon
Pronunciation: /ˈɛpsɪlɒn
, ɛpˈsʌɪlɒn


  • 1The fifth letter of the Greek alphabet (Ε, ε), transliterated as ‘e’.
  • 1.1 [as modifier] Denoting the fifth in a series of items, categories, etc.: epsilon and gamma globins diverged about 100 million years ago
  • 1.2 (Epsilon) [followed by Latin genitive] Astronomy The fifth star in a constellation: Epsilon Carinae
    More example sentences
    • The most likely destinations are the stars closest to Earth, such as Alpha Centauri and Proxima Centauri, Tau Ceti, and Epsilon Eridani.
    • The star Epsilon Eridani, 10 light years from Earth, was then found to have exactly the disc clumps predicted by the computer models.
    • The University of Texas team found a planet similar in size to Jupiter about 10.5 light years away from Earth orbiting the star Epsilon Eridani, a star very similar to the sun.


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  • (ε) Permittivity.


Greek, 'bare or simple E', from psilos 'bare'.

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