einstein
Ein·stein/ˈaɪnˌstaɪn/noun
einstein is spelled E-I-N-S-T-E-I-N: 8 letters and 2 syllables (Ein·stein). It appears 5.5 times per million words in written English, the 10,519th most frequent word form (wordfreq, 2021 data). As a noun, einstein means “One mole of photons, regardless of frequency, as used to measure irradiance” (English Wiktionary, September 2026). The plural of einstein is einsteins.
How many letters and syllables are in einstein?
| Letters | 8: E-I-N-S-T-E-I-N |
|---|---|
| Syllables | 2: Ein·stein |
| In writing | 5.5 times per million words; the 10,519th most frequent word form |
| Wrong spellings searched | none measured in search |
| Same letters |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; 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 einstein?
Einstein appears 5.5 times per million words in written English, the 10,519th 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 einstein?
- US /ˈaɪnˌstaɪn/
- US /ˈaɪnˌʃtaɪn/
- Australia /ˈɑenˌstɑen/
Einstein has 2 syllables, split Ein·stein in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-Einstein.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with einstein?
No other word on PlainSpell ends in the same sounds as einstein (/aɪnstaɪn/).
Spelled with the same letters in another order: nineties.
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 einstein
- einsteins plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does einstein mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
datedOne mole of photons, regardless of frequency, as used to measure irradiance.
The einstein (symbol E) is an obsolete unit with two conflicting definitions.
- 2
informalA genius; a very smart person.
He's a prodigy – they call him their little einstein.
- 3
informalAn idiot; a very stupid person.
Yeah, that guy is a real einstein – he always finds a way to mess up the simplest order.
- 4
A shape that can be repeated to cover a plane with a nonrepeating pattern.
noun
- 1
An extremely clever or intelligent person.
Can you believe he's just a kindergartener? It looks like they've got an Einstein in the family.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does einstein come from?
Named in honor of Albert Einstein, who explained the photoelectric effect.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).