Eocene
/ˈiːəsiːn/
"eocene" is a 6-letter English headword indexed on PlainSpell.
The verdict
“Eocene” is a moderately-common English word, ranked #36,127 in English word frequency and used as an adjective.
- #36,127
- frequency rank, English
- 6
- letters
- 7
- tracked misspellings
- 2
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of a geologic epoch within the Paleogene period from about 56 to 34 million years ago.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | Eocene |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˈiːəsiːn/ |
| Letters | 6 |
| Frequency rank | #36,127 |
| Misspellings tracked | 7 |
| Confusable pairs | 2 |
| Source | Wiktionary (kaikki.org) |
Where “Eocene” sits in English frequency
Spelling & Dictionary Insight
The English entry for Eocene is 6 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˈiːəsiːn/. Corpus data places it at rank #36,127 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "Of a geologic epoch within the Paleogene period from about 56 to 34 million years ago.".
Our generated misspelling index lists 7 likely wrong-spelling variants for Eocene, with forms such as "ecoene", "eoccene", and "eoceen". 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. It also participates in 2 confusable-pair relationships, "Eugene", "emcee", since the words sound or look close enough that writers reach for the wrong one mid-sentence.
Etymologically, the entry records: From Ancient Greek ἠώς (ēṓs, “dawn”) + καινός (kainós, “new”) and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. Coined by English polymath William Whewell in 1831 for Charles Lyell, who introduced it in 1833 in his book Princi… The correct English form is Eocene, spelled E-O-C-E-N-E.
Definition
- 1Of a geologic epoch within the Paleogene period from about 56 to 34 million years ago.
Etymology
From Ancient Greek ἠώς (ēṓs, “dawn”) + καινός (kainós, “new”) and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. Coined by English polymath William Whewell in 1831 for Charles Lyell, who introduced it in 1833 in his book Principles of Geology. By surface analysis, eo- + -cene.
This word in other languages
Common misspellings
Also misspelled as: ecoene,eoccene,eoceen,eocenne,eocnee,eoecne,oecene
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of Eocene - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
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
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Using “Eocene”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is E-O-C-E-N-E - every other letter order is a misspelling in standard orthography.
- Say it as /ˈiːəsiːn/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “Eugene” - see the side-by-side comparison. Eocene vs Eugene
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.