eon
/ˈi.ɑn/noun
eon is spelled E-O-N: 3 letters and 2 syllables. It appears about once in every 2 million words in written English, the 41,660th most frequent word form (wordfreq, 2021 data). As a noun, eon means “Eternity, the duration of the universe” (English Wiktionary, September 2026). The plural of eon is eons.
How many letters and syllables are in eon?
| Letters | 3: E-O-N |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 2 million words; the 41,660th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with | |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is eon?
Eon appears about once in every 2 million words in written English, the 41,660th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce eon?
- US /ˈi.ɑn/
- US /ˈeɪ.ɑn/
- UK /ˈiː.ɔn/
Eon has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-eon.ogg, En-au-eon.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with eon?
2 words on PlainSpell end in the same sounds as eon from its last stressed vowel (/iɑn/):
Spelled with the same letters in another order: one, neo.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of eon
- eons plural
- aeon
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does eon mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Eternity, the duration of the universe.
- 2
An immeasurably or indefinitely long period of time.
- 3
USinformalA long period of time.
It’s been eons since we last saw each other.
- 4
A period of one billion (short scale, i.e. 1,000,000,000) years; a gigayear.
- 5
The longest geochronologic unit, being a period of hundreds of millions of years; subdivided into eras.
- 6
A spirit being emanating from the Godhead.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Eon in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | éternité , éon , bail |
| Portuguese | eternidade , éon |
| Spanish | eón, eternidad , añares , evo |
| German | Äon |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does eon come from?
From Latin aeon, from Ancient Greek αἰών (aiṓn, “age, era”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).