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PlainSpell

once

UK /wʌn(t)s/adverb, conjunction

once is spelled O-N-C-E: 4 letters and one syllable. It appears 339 times per million words in written English, the 274th most frequent word form (wordfreq, 2021 data). People search “once vs ounce” about 20 times a month (Google, United States). As an adverb, once means “One and only one time” (English Wiktionary, September 2026).

How many letters and syllables are in once?

Letters4: O-N-C-E
Syllables1 (from its American pronunciation)
In writing339 times per million words; the 274th most frequent word form
Wrong spellings searchednone measured in search
Pairs people search
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); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.

How common is once?

Once appears 339 times per million words in written English, the 274th 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 once?

  • /wʌn(t)s/
  • UK /wʌn(t)s/
  • UK /wɒn(t)s/

Once has one syllable (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-once.ogg, Wikimedia Commons (author and licence on each file's page).

Words people confuse with once

Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).

once vs ounce20 G

Also written: ounce.

Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).

What rhymes with once?

No other word on PlainSpell ends in the same sounds as once (/ʌns/).

Spelled with the same letters in another order: cone.

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).

What does once mean?

The meanings the English Wiktionary records, quoted as written there (source below).

adverb

  1. 1

    One and only one time.

    I have only once eaten pizza.

  2. 2

    Formerly; during some period in the past.

    He was once the most handsome man around.

  3. 3

    obsoleteAt any time; ever.

    If the facts once became known, we'd be in trouble.

  4. 4

    obsoleteOne day, someday.

  5. 5

    Multiplied by one: indicating that a number is multiplied by one.

    Once three is three.

conjunction

  1. 1

    As soon as; when; after.

    Near-synonym: immediately

noun

as Once
  1. 1

    slangA fan of the Korean girl band Twice.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Once in Spanish, French, German and Portuguese

LanguageWords
Frenchune fois (one and only one time), autrefois, jadis, un temps (formerly), aussitôt que, dès que (as soon as)
Germaneinmal (one and only one time), früher (formerly), als, sobald (as soon as)
Portugueseuma vez (one and only one time), outrora (formerly), assim que, logo após/depois, tão logo (as soon as)
Spanishuna vez (one and only one time), antiguamente, anteriormente, otrora, antaño, antes (formerly)

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 once come from?

From Middle English ones, from Old English ānes, a remodelling (after ān (“one”)) of ǣnes, itself an extension of ǣne (“once”) with the genitive suffix -es. Equivalent to one + -s. Cognate with Saterland Frisian enst, insen (“once”), West Frisian iens (“once”), Dutch eens (“once”), German Low German eens, ins (“once”), German einst (“once”). More at one (including regarding the development of the pronunciation) and -s.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What to look up after once