Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The fifth letter of the Greek alphabet.

from The Century Dictionary.

  • noun In mathematics, a quantity which approaches zero when the independent variable approaches a certain limit fixed for it by the conditions of the particular problem or discussion.
  • noun The fifth letter of the Greek alphabet, equivalent to short e.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The name for the fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
  • noun phonetics In IPA, the phonetic symbol that represents the open-mid front unrounded vowel; represented in SAMPA as E.
  • noun mathematics An arbitrarily small quantity.
  • noun computing, colloquial A negligible effect.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the 5th letter of the Greek alphabet

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek e psīlon, simple e, from neuter of psīlos, simple.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἒψιλόν (epsilon, "the letter Ε").

Examples

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