epsilon.
The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
Meaning & usage
The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
In IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel.
An arbitrarily small quantity.
An arbitrarily small quantity. A small child.
Something negligible or insignificant.
Yes, we have to convert all the symbol names to upper case at startup, but that’s epsilon.
The percentage change in an option value with respect to the underlying dividend yield.
Where this word comes from
From Ancient Greek ἒ ψιλόν (è psilón, “simple Ε”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.