epsilon

/ɛpˈsaɪ.lən/

//ɛpˈsaɪ.lən// noun

By · According to Wiktionary data (CC BY-SA) ·

"epsilon" is a 7-letter English headword indexed on PlainSpell.

The verdict

“epsilon” has 10 generated spelling variants in the English index at frequency #33,640. The variants make it a useful spelling check.

#33,640
frequency rank, English
2,246
“E” headwords
10
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).

Corpus desk

Index EN-epsilon · epsilon · English

epsilon · rank #33,640 · 10 variants · 0 confusables

  • FREQ-MID #33,640
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-MID 10 variants
  • BOOK-MID 2,246
  • PHOTO-FINISH entanglement

Nearest frequency peer: entanglement (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “epsilon”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “epsilon” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for epsilon
PropertyValue
Headwordepsilon
LanguageEnglish
Part of speechNoun
IPA/ɛpˈsaɪ.lən/
Letters7
Frequency rank#33,640
Misspellings tracked10
Confusable pairs0
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “epsilon”

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).epsilonlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “entanglement” (#33,639), “ESC” (#33,641), “Engels” (#33,638). Among 2,246 “E” headwords, “epsilon” is #33,640. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around epsilon (IPA /ɛpˈsaɪ.lən/), anoun. Corpus frequency is #33,640 among 2,246 “E” headwords. Wiktionary lists 6 senses, so context still picks the gloss.

Our generated misspelling index lists 10 likely wrong-spelling variants for epsilon, with forms such as "epislon", "eppsilon", and "epsillon". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. No confusable counterpart is on file for this word, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From Ancient Greek ἒ ψιλόν (è psilón, “simple Ε”). The correct English form is epsilon, spelled E-P-S-I-L-O-N.

Definition

  1. 1
    The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
  2. 2
    In IPA, the phonetic symbol ɛ that represents the open-mid front unrounded vowel.
  3. 3
    An arbitrarily small quantity.
  4. 4
    An arbitrarily small quantity.
  5. 5
    Something negligible or insignificant.
  6. 6
    The percentage change in an option value with respect to the underlying dividend yield.

Recorded use

Wiktionary examples

These source excerpts show how epsilon appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Yes, we have to convert all the symbol names to upper case at startup, but that’s epsilon.
  2. All right, okay. My interest is epsilon.

Etymology

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

This word in other languages

épsilon(Español)epsilon(Français)Epsilon(Deutsch)

Common misspellings

Also misspelled as:

  • epislon
  • eppsilon
  • epsillon
  • epsilno
  • epsilonn
  • epsioln
  • epslion
  • epssilon
  • espilon
  • pesilon

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of epsilon - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

epislon2eppsilon1epsillon1epsilno2epsilonn1epsioln2epslion2epssilon1
Edit distance from "epsilon"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "epsilon"?
"epsilon" is spelled E-P-S-I-L-O-N. The IPA pronunciation is /ɛpˈsaɪ.lən/.
What does "epsilon" mean?
As a noun, "epsilon" means: The fifth letter of the Greek alphabet, ε or Ε, preceded by delta (Δ, δ) and followed by zeta (Ζ, ζ).
What are common misspellings of "epsilon"?
Common misspellings include "epislon", "eppsilon", "epsillon", "epsilno", "epsilonn". The correct spelling is "epsilon".
How do you pronounce "epsilon"?
The IPA (International Phonetic Alphabet) transcription for "epsilon" is /ɛpˈsaɪ.lən/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "epsilon"?
From Ancient Greek ἒ ψιλόν (è psilón, “simple Ε”). See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "epsilon", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 7 letters (nearest by frequency rank).

emotive#33,634flowery#33,654Grimsby#33,664hapless#33,671

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

hidalgo10 variantscuteness10 variantscourted10 variantsinroads10 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list