Ninth is the correct spelling. Nineth is a common misspelling and does not appear as a variant in standard dictionary entries. Ninth is the ordinal form of nine, and it drops the final e before the th ending. Getting it right matters in grades, rankings, dates, and formal documents.
Many writers add the e because the number nine ends with one, or because they spell the word the way they hear it. This guide explains why ninth is correct, how to pronounce it, how it differs from ninety, and how to remember it in school, sports, dates, and business writing.
Nineth vs Ninth: Quick Answer
Use ninth every time. It means “number nine in a sequence.”
| Form | Status | Example |
| Ninth | Correct standard spelling | She finished ninth in the race. |
| Nineth | Misspelling | She finished nineth in the race. (incorrect) |
No formal, regional, or informal context makes nineth the preferred spelling.
Is It Nineth or Ninth?
It is ninth. The answer is the same in American English, British English, and other standard varieties.
The word works in three ways:
- Adjective: “He lives on the ninth floor.”
- Adverb: “She came ninth in the competition.”
- Noun: “A ninth of the budget was spent.” Also “She arrives on the ninth.”
Why “Nineth” Looks Correct to So Many People
English usually forms ordinals by adding th to the cardinal number. Fourth, sixth, seventh, and tenth all follow that pattern, so nine plus th feels like it should give nineth.
The eye also expects to see the silent e of nine again. When writers think “nine, then th,” they often type exactly that.
Speaking adds to the problem. Say “nine” and “th” slowly, and the two parts sound like separate pieces. Written ninth merges them into one syllable.
Why English Uses Ninth Instead of Nineth
Spelling follows history more than logic. Etymonline traces ninth to Middle English nynþe around 1300, a form reshaped under the influence of nine from the Old English nigoða. The word has no vowel between the n and the th in that record.
The e-dropping pattern appears in a few other ordinals:
- nine becomes ninth
- twelve becomes twelfth
It is not a universal rule, because five becomes fifth with a v-to-f change. Treat each ordinal as a pattern to learn, not a formula.
Cardinal vs Ordinal Numbers
Cardinal numbers show quantity. Ordinal numbers show position or order.
| Type | Purpose | Examples |
| Cardinal | Counting how many | one, nine, ninety |
| Ordinal | Ranking or ordering | first, ninth, ninetieth |
“I have nine books” uses a cardinal. “This is my ninth book” uses an ordinal.
Why Some Ordinal Numbers Change Spelling
Most ordinals add th, but several change the base word:
- one becomes first, and two becomes second, which look nothing like the cardinals
- five becomes fifth
- eight becomes eighth, with only one t
- nine becomes ninth, with no e
- twelve becomes twelfth
- twenty becomes twentieth, with y changing to ie
Because the changes vary, learning the exceptions is easier than searching for one universal rule.
What Are Ordinal Numbers and Why Do They Matter?
Ordinal numbers tell readers where something sits in a sequence. They appear in rankings, schedules, addresses, titles, and formal documents. A wrong spelling in these settings can reduce trust in the whole text.
School Examples
Ordinals label levels, chapters, and exam positions.
- “Maya starts ninth grade in August.”
- “Read the ninth chapter before Friday.”
Sports Examples
Ordinals report results and stages of a game.
- “He finished ninth in the 400-meter final.”
- “The pitcher tired in the ninth inning.”
Dates and Time
Ordinals name days and anniversaries.
- “The meeting is on the ninth of March.”
- “Her ninth birthday is next week.”
Business and Reports
Ordinals number periods, items, and versions.
- “Revenue rose in the ninth month of operation.”
- “The ninth item on the agenda is the budget review.”
Real Examples of Ninth in Everyday Writing
These examples show the word in settings readers meet often.
Education
In most US schools, ninth grade is the first year of high school, usually for students aged 14 to 15. Before a noun, the phrase takes a hyphen: “a ninth-grade teacher.” After a verb, it does not: “She is in ninth grade.”
Sports Rankings
- “The club climbed to ninth in the league table.”
- “She qualified in ninth position.”
Dates and Calendars
“The ninth of June” and “June 9” are both acceptable. Many style guides prefer plain numerals for dates, so follow the guide your publication uses.
Publishing and Books
- “This is the ninth edition of the textbook.”
- “The ninth novel in the series is out in spring.”
The History Behind the Word Ninth
Ninth comes from Old English nigoða, and the form nynþe appears around 1300. Wiktionary adds that the n was reinserted by analogy with nine. That influence explains why ninth looks like nine with th attached.
Neither source suggests that nineth was ever a standard spelling, so there is no historical case for it.
Why Dictionaries Accept Ninth but Reject Nineth
Dictionaries record how writers spell words in edited, published text. Dictionary.com’s entry for ninth, which includes American and British sources, lists only the one spelling. Britannica’s dictionary likewise defines ninth as occupying the number nine position in a series.
Nineth appears mainly as an error in unedited writing. A spelling needs consistent use in edited text before dictionaries record it, and nineth has not reached that point.
Common Mistakes People Make With Ninth
Assuming Every Number Uses “-th”
- Incorrect: nineth
- Correct: ninth
The th ending is common, but it does not attach unchanged to every number. Check whether the base word loses or changes a letter.
Confusing Pronunciation With Spelling
Saying “nine-th” slowly makes the word sound like two parts. The standard pronunciation is one syllable, and the spelling follows history, not a sound-by-sound transcription.
Depending Too Much on Autocorrect
Autocorrect catches many errors, but not all. A word added to a personal dictionary stops being flagged. Read ordinals yourself before publishing.
Case Study: One Small Letter Can Change Perception
This is an illustrative scenario, not a real study. A job applicant writes, “I ranked nineth in my class.” The achievement is real, but the reader notices the spelling error first.
Readers judge text quickly. One error in a short, prominent phrase can pull attention from the message. The same sentence with ninth reads cleanly and keeps the focus on the result.
Why Correct Spelling Matters More Than You Think
Accurate spelling supports clarity and credibility. In school work, applications, reports, and public posts, a small error can weaken a strong message.
It also matters in names and titles, where a misspelling looks careless. Examples include the Ninth Amendment or a book titled The Ninth Hour.
Memory Tricks to Remember Ninth
Drop-the-E Rule
Nine loses its e when it becomes ninth. Picture the e dropping off as the th arrives. The same idea explains twelfth.
Visual Memory Trick
Write nine, cross out the e, and add th. Nine has four letters (n, i, n, e). Ninth keeps the first three and ends with t and h, which gives n, i, n, t, h.
Sentence Method
Repeat this: “Nine loses the e and gains th.” A short phrase is easy to recall when you write.
Similar English Spelling Mistakes
Other ordinals cause similar trouble:
| Incorrect | Correct | Note |
| eigth | eighth | Eight already ends in t, so add only h. |
| twelvth | twelfth | The v disappears. |
| fivth | fifth | The v changes to f. |
| fourtieth | fortieth | Forty has no u. |
| twentyth | twentieth | The y changes to ie. |
Nineth or Ninth Meaning
Ninth means the number nine in a series, or one of nine equal parts of something. It also names a music interval of an octave plus a second. Nineth has no separate meaning, because it is only a misspelling of the same word.
- Position: “He came ninth in line.”
- Fraction: “A ninth of the class was absent.”
- Music: “The composer ends the phrase on a ninth.”
Nineth or Ninth Pronunciation
Ninth is pronounced /naɪnθ/. It has one syllable: the word nine followed directly by the th sound. Dictionary.com gives the same transcription for the American and British entries.
Do not add a vowel between the n and the th. Place the tongue lightly against the front teeth for the final sound.
Nineth or Ninth British
British English uses the ninth, just like American English. The British (Collins) entry on Dictionary.com defines ninth as coming after the eighth, and often written 9th.
The real differences are elsewhere:
- Date order: “9 March” in British style and “March 9” in American style.
- School years: US ninth grade is roughly Year 10 in England.
Ninth or Ninety
Ninth and ninety look alike but do different jobs.
| Word | Type | Meaning | Example |
| Ninth | Ordinal | Position nine in order | She is ninth in line. |
| Ninety | Cardinal | The number 90 | The room holds ninety people. |
| Ninetieth | Ordinal | Position 90 in order | He celebrated his ninetieth birthday. |
Ninety keeps the e from nine, but ninth drops it. For ninety-nine, the ordinal is ninety-ninth.
9th Spelling
The short form is 9th: the numeral 9 followed by th. It has no e, matching the full word.
- Correct: 9th, ninth
- Incorrect: 9nth, 9eth
Many style guides spell out small ordinals in running text, such as “the ninth floor,” and use numerals in dates and tables. Follow the guide for your publication.
Quick Nineth vs Ninth Cheat Sheet
- Correct spelling: ninth
- Incorrect spelling: nineth
- Short form: 9th
- Ordinal of ninety: ninetieth
- Pronunciation: /naɪnθ/, one syllable
- Rule: nine drops its e before th
- Region: same in British and American English
Frequently Asked Questions
Is nineth a word?
Not in standard English. Dictionaries list ninth, and nineth is treated as a misspelling.
Do you hyphenate ninth grade?
Hyphenate it before a noun, as in “ninth-grade student.” Leave it open after a verb, as in “She is in ninth grade.”
How do you write one ninth as a fraction?
Write it as 1/9, or spell it one-ninth. Some style guides vary on the hyphen, so check yours.
What is ninth in Roman numerals?
Nine is IX, so ninth is often shown as IX in titles, such as a ninth symphony or volume.
What are the ordinals of 19 and 99?
They are nineteenth and ninety-ninth. Both keep the e from the cardinal stem, unlike ninth.
Should ninth be capitalized?
Only at the start of a sentence or in proper names, such as the Ninth Amendment.
What is ninthly?
Ninthly is an adverb meaning “as the ninth point,” used to link a statement to the previous ones. It belongs to the series of firstly, secondly, and so on.
Final Thoughts
The correct spelling is ninth, not nineth. It is the ordinal form of nine, and it drops the final e before th. Remember that pattern, check similar ordinals such as eighth and twelfth, and read your text before publishing.