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epsilon Line breaks: ep¦si|lon
Pronunciation: /ˈɛpsɪlɒn/

Definition of epsilon in English:


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

Words that rhyme with epsilon

nylon • Orlon

Definition of epsilon in:

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Pronunciation: fôrˈtisəˌmō
(especially as a direction) very loud or loudly