epsilon

plural epsilons · plural epsila

1. countableuncountableThe fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
2. countableuncountablehuman sciencesIn IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel.
3. countableuncountablemathematicsAn arbitrarily small quantity.
   1. colloquialcountableuncountablemathematicsA small child.
4. colloquialcountableuncountablecomputingSomething negligible or insignificant.

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

   1 more example

   All right, okay. My interest is epsilon.

   2017, Dean Koontz, The Silent Corner, page 106

5. countableuncountablebusinessThe percentage change in an option value with respect to the underlying dividend yield.