epsilon

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɛpsɪˌlɒn/, /ɛpˈsaɪlən/

US:USA pronunciation: respellingUSA pronunciation: respelling(ep′sə lon′, -lən or, esp. Brit., ep sī′lən)



WordReference Random House Unabridged Dictionary of American English © 2026
ep•si•lon  (ep′sə lon′, -lən or, esp. Brit., ep sī′lən),USA pronunciation n. 
  1. Linguisticsthe fifth letter of the Greek alphabet (E, ε).
  2. Linguisticsthe consonant sound represented by this letter.
  3. Mathematicsan arbitrarily small quantity, used to indicate that a given quantity is small, or close to zero.
  • Greek è psīlón bare, simple e (as opposed to diphthongal spellings which in later Greek represented the same sound)

Collins Concise English Dictionary © HarperCollins Publishers::
epsilon /ˈɛpsɪˌlɒn; ɛpˈsaɪlən/ n
  1. the fifth letter of the Greek alphabet (Ε, ε), a short vowel, transliterated as e
Etymology: Greek e psilon, literally: simple e
'epsilon' also found in these entries (note: many are not synonyms or translations):
epsilon-delta - epsilon-neighborhood - Vega

Forum discussions with the word(s) "epsilon" in the title:


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