Definition of Epsilan

The name for the fifth letter of the Greek Alphabet, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
(phonetics) In IPA, the phonetic symbol that represents the front half open unrounded vowel. Represented in SAMPA as E.
(mathematics) An arbitrarily small quantity.
(computing, colloquial) A negligible effect.
Yes, we have to convert all the symbol names to upper case at startup, but that's epsilon.
The lowest scientific caste of people in the novel Brave New World by Aldous Huxley.

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