Ninth is the correct spelling. Nineth is a common misspelling, even though it looks logical because the number is nine. When you add the ordinal ending to nine, the final e drops out, giving you ninth, the word for the position that comes after eighth and before tenth.
This guide explains why the e disappears, how to pronounce the word, and how ninth compares with 9th and ninetieth. You will also find correct examples, spelling mistakes to avoid, and simple memory tricks that make the spelling easy to recall. Whether you are filling out a form or writing an essay, you will know the right choice.
Nineth or Ninth: The Quick Answer
Ninth Is Correct, While Nineth Is Incorrect
Ninth is the only accepted spelling in standard English. Nineth is not listed as a valid word in major dictionaries, so spell checkers flag it. If you see it in a draft, change it to ninth.
How to Spell 9th in Words
The written form of 9th is ninth. Spell it N-I-N-T-H, with no letter e between the n and the t.
What Does Ninth Mean?
Ninth as an Ordinal Number
Ninth is an ordinal number. It describes position in a sequence: the one that comes right after the eighth and right before the tenth. It also names one of nine equal parts of a whole.
Nine vs. Ninth: Quantity vs. Position
Nine tells you how many. Ninth tells you which one. Compare “nine students” with “the ninth student in line.” The first counts people, and the second places one person in order.
Why Is It Ninth and Not Nineth?
The Simple Nine to Ninth Spelling Rule
Most ordinals are made by adding th to the number: sixth, seventh, eleventh. Nine follows the same idea, but its silent e is dropped first. Nine plus th becomes ninth.
Why the Final E Is Dropped
The e in nine is silent, and English spelling often removes or changes endings when an ordinal suffix is added. Other numbers behave in similar ways, as the table below shows.
| Number | Ordinal | What Changes |
| Five | Fifth | ve becomes f |
| Eight | Eighth | Only h is added |
| Nine | Ninth | Final e is dropped |
| Twelve | Twelfth | ve becomes f |
| Nineteen | Nineteenth | Nothing is dropped, th is added |
| Ninety | Ninetieth | y becomes ie, then th is added |
Why “Nineth” Looks Correct but Is Still a Misspelling
Nineth feels logical because it simply adds th to nine. Writers trust that pattern, but the standard spelling does not follow it. The mistake is understandable, and it is still a mistake.
Ninth vs. Nineth Examples
Correct Sentences With Ninth
• “She finished ninth in the national spelling contest.”
• “Our office is on the ninth floor.”
• “The team scored two runs in the ninth inning.”
Common Incorrect Sentences With Nineth
• “He lives on the nineth floor.” (should be ninth)
• “Today is the nineth of the month.” (should be ninth)
• “This is my nineth year here.” (should be ninth)
Ninth in Dates, Rankings, Grades, and Everyday Writing
• Dates: “The meeting is on the ninth of October.”
• Rankings: “She placed ninth overall.”
• Grades: “My brother is in ninth grade.”
• Everyday writing: “This is the ninth time I have called.”
How Is Ninth Pronounced?
Ninth Pronunciation and Phonetic Spelling
Ninth has one syllable and sounds like “nynth,” rhyming roughly with the first part of “pinth.” In phonetic notation it is written /naɪnθ/. The word ends with the soft th sound, as in “think.”
Why Ninth Can Be Difficult to Say
The n sound, the th sound, and the second n sit close together. The tongue has to move quickly from the ridge behind the teeth to between the teeth. Say it slowly at first, then speed up.
Ninth, 9th, Nine, and Ninetieth Compared
Nine vs. Ninth
Nine is a cardinal number that shows quantity. Ninth is an ordinal number that shows order.
Ninth vs. 9th
They mean the same thing. Use 9th in tables, dates, and quick notes, and write ninth in formal prose or when the number begins a sentence.
Ninth vs. Ninetieth
These two look alike but are far apart. Ninth is position 9, while ninetieth is position 90.
| Word | Form | Meaning | Example |
| Nine | Cardinal number | The quantity 9 | “I bought nine pens.” |
| Ninth | Ordinal number | Position 9 | “She was ninth in line.” |
| 9th | Ordinal numeral | Position 9 in short form | “Due on the 9th.” |
| Ninetieth | Ordinal number | Position 90 | “He turned ninety on his ninetieth birthday.” |
How Is Ninth Used in American and British English?
Ninth in American English
American English uses ninth in all the same ways: ninth grade, ninth inning, and the Ninth Amendment. Dates are usually written with the month first, such as October 9th.
Ninth in British English
British English spells it the same way. The main difference is date style, where people often write 9th October or the ninth of October.
Does the Spelling Ever Change?
No. Ninth is the same in American and British English, and in Canada and Australia as well. Only the date order and wording around it change.
Ninth in Fractions and Other Uses
What Does One Ninth Mean?
One ninth means one part out of nine equal parts, written as 1/9. Two ninths is 2/9, and so on. In fractions the plural is ninths.
Ninth as a Noun and Adjective
• Adjective: “the ninth chapter”
• Noun: “He was the ninth to arrive.”
• Adverb: “She finished ninth.”
Common Expressions With Ninth
• Ninth grade and ninth inning
• Beethoven’s Ninth, a well known symphony
• The Ninth Amendment and the Ninth Circuit in US law
• A ninth in music, an interval spanning nine notes
Note that “on cloud nine” uses nine, not ninth.
Easy Ways to Remember the Spelling of Ninth
The NINE Minus E Plus TH Memory Trick
Take nine, remove the e, and add th. That gives you n-i-n plus th, or ninth. Say it as a short rule: drop the E, add TH.
Remember Eighth, Ninth, Tenth
Picture the sequence eighth, ninth, tenth. All three end in th, and none of them shows a stray e before it. If ninth sits between two words you already know, the spelling feels natural.
Common Mistakes With Ninth
Nineth vs. Ninth
The most frequent error is adding an extra e. Always write ninth.
Ninteenth vs. Nineteenth
Some writers drop the e in nineteenth too. That word keeps its e because it is built from nineteen, so write nineteenth.
Confusing Ninth With Ninetieth
Ninth is 9th and ninetieth is 90th. Check the number before you pick the word, especially in dates, ages, and rankings.
Frequently Asked Questions
Is it nineth or ninth?
Ninth is correct. Nineth is a misspelling.
How do you spell 9th in words?
It is spelled ninth, with no e before the th.
Why is ninth spelled without an e?
The silent e in nine is dropped when th is added. The result is ninth.
Is nineth a real English word?
No. Standard dictionaries do not list nineth as a valid word.
What is the difference between nine and ninth?
Nine shows quantity, while ninth shows position in order.
How do you pronounce ninth?
It is one syllable, pronounced like nynth, ending in the th sound.
Is ninth the same in American and British English?
Yes. The spelling is identical, though date formats can differ.
Conclusion
Ninth is the correct spelling, and nineth is simply a mistake. Remember the rule: drop the e from nine, then add th.
Use ninth for position, nine for quantity, and 9th when a short form fits. Keep ninth apart from ninetieth and nineteenth, and you will spell it correctly every time.
