Epsilon

//ɛpˈsaɪ.lən// noun, slang

noun, slang ·Moderate ·College level

Definitions

Noun
  1. 1
    The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ). countable, uncountable
  2. 2
    the 5th letter of the Greek alphabet wordnet
  3. 3
    In IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel. countable, uncountable
  4. 4
    An arbitrarily small quantity. countable, uncountable
  5. 5
    An arbitrarily small quantity.; A small child. colloquial, countable, uncountable
Show 2 more definitions
  1. 6
    Something negligible or insignificant. colloquial, countable, uncountable

    "Yes, we have to convert all the symbol names to upper case at startup, but that’s epsilon."

  2. 7
    The percentage change in an option value with respect to the underlying dividend yield. countable, uncountable

Synonyms

All synonyms
epsilon variant

Example

More examples

"But forecasters say it is likely Bermuda will be sideswiped by Epsilon when it makes its closest pass sometime late Thursday."

Etymology

From Ancient Greek ἒ ψιλόν (è psilón, “simple Ε”).

Related phrases

epsilon ironepsilon numberepsilon-machinemachine epsilondividend yieldgreek alphabetinternational phonetic alphabet

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.