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PlainSpell

only

on·lyUK /ˈəʊn.li/adjective, adverb, conjunction, noun, particle

only is spelled O-N-L-Y, 2 syllables: on·ly. The wrong spelling people search most is lonly: about 160 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 73 of all searches for the word. Only is an adjective meaning “Alone in a category”.

How many letters and syllables are in only?

Letters4: O-N-L-Y
Syllables2: on·ly
In writing1,318 times per million words; the 81st most frequent word form
Wrong spellings searched2; the most searched, lonly, about 160 Bing searches a month (all of them)

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); 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).

How do you spell only?

Only is spelled O-N-L-Y. 2 wrong spellings are searched or written often enough to measure; together they are about 1 in 61 of the searches for only in either form.

onlythe right spelling11,480 searches a month
lonlyan extra l160 searches a month
onyll and y swapped30 searches a month

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). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.

How common is only?

Only appears 1,318 times per million words in written English, the 81st 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 only?

  • /ˈoʊn.li/
  • UK /ˈəʊn.li/
  • UK /ˈəʊn.i/

Only has 2 syllables, split on·ly in writing.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-only.wav, En-us-only.ogg, LL-Q1860_(eng)-Naomi_Persephone_Amethyst_(NaomiAmethyst)-only.wav, Wikimedia Commons (author and licence on each file's page).

Forms of only

  • onlys plural
  • onlies plural

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

What does only mean?

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

adjective

  1. 1

    Alone in a category.

    He is the only doctor for miles.

  2. 2

    Singularly superior; the best.

  3. 3

    Without sibling; without a sibling of the same gender.

    He is their only son, in fact, an only child.

  4. 4

    obsoleteMere.

adverb

  1. 1

    Without others or anything further; exclusively.

    My heart is hers, and hers only.

  2. 2

    No more than; just.

    To DAD who only reared twelve children and To MOTHER who reared twelve only children

  3. 3

    As recently as.

  4. 4

    Emphasizing something that is just or necessary.

    It's only fair to let him borrow your kite, after you've had his toys all day.

  5. 5

    UKUsed to express surprise or consternation at an action.

    She's only gone and run off with the milkman!

  6. 6

    IrelandinformalJust, simply, undoubtedly.

    Sure you're only gorgeous!

  7. 7

    Introduces a disappointing or surprising outcome that renders futile something previously mentioned.

    They rallied from a three-goal deficit only to lose in the final two minutes of play.

  8. 8

    obsoleteAbove all others; particularly.

conjunction

  1. 1

    informalUnder the condition that; but.

    You're welcome to borrow my bicycle, only please take care of it.

  2. 2

    informalBut, except; but in fact.

    I would enjoy running, only I have this broken leg.

noun

  1. 1

    An only child.

particle

  1. 1

    Placed at the end of a sentence to emphasize that something is trivial, small, undemanding or deserving of belittlement.

    Just need to replace the filter only.

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

Only in Spanish, French, German and Portuguese

LanguageWords
Frenchunique, seul (1. alone in a category), seulement, ne...que, uniquement (without others or anything further; exclusively), que (no more than)
Germaneinzig (1. alone in a category), nur, lediglich (without others or anything further; exclusively), einzigartig (2. singularly superior; the best), geschwisterlos, Einzelkind (3. without sibling)
Portugueseúnico (1. alone in a category), apenas, somente (without others or anything further; exclusively), melhor (2. singularly superior; the best), filho único (3. without sibling), mas (but)
Spanishúnico, señero (1. alone in a category), sólo, solamente, solo, tan solo (without others or anything further; exclusively)

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 only come from?

From Middle English oonly, only, from Old English ānlīċ, ǣnlīċ (“only; singular; solitary”), from Proto-Germanic *ainalīkaz. Cognate with obsolete Dutch eenlijk, German ähnlich (“similar”), Old Norse álíkr, Swedish enlig (“unified”). By surface analysis, on(e) + -ly.

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

What to look up after only