ninth

American  

[nahynth] / naɪnθ /

adjective

1. next after the eighth; being the ordinal number for nine.

2. being one of nine equal parts.

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noun

• ninths
  plural

1. a ninth part, especially of one (1/9).

2. the ninth member of a series.

3. Music.

   1. a tone distant from another tone by an interval of an octave and a second.

   2. the interval between such tones.

   3. harmonic combination of such tones.

adverb

1. in the ninth place.

ninth British  

/ naɪnθ /

adjective

1. (usually prenominal)

   1. coming after the eighth in counting order, position, time, etc; being the ordinal number of nine. Often written: 9th

   2. ( as noun )

      he came on the ninth

      ninth in line

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noun

1. 1. one of nine equal or nearly equal parts of an object, quantity, measurement, etc

   2. ( as modifier )

      a ninth part

2. the fraction equal to one divided by nine ( 1/ 9 )

3. music

   1. an interval of one octave plus a second

   2. one of two notes constituting such an interval

   3. See ninth chord

adverb

1. Also: ninthly. after the eighth person, position, event, etc

1. Also: ninthly. as the ninth point: linking what follows to the previous statement

Other Word Forms

Derived Forms

• ninthly
  adverb

Inflected Forms

Nouns

• ninths
  plural

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Etymology

Origin of ninth

before 900; Middle English ninthe ( see nine, -th ²), replacing Middle English niend ( Old English nigend ), neogethe, nigethe ( Old English nigotha ); akin to Old Saxon nigutho, Old Norse nīundi, Gothic niunda

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Example Sentences

See Examples For:

ninth ninths

The 20-year-old Italian, who leads team-mate George Russell by 123 points in the standings, will secure the title in Mexico City on Sunday by finishing ninth or higher.

From BBC ● Oct. 27, 2026

“If you’re in ninth grade and you’re talking to them about retirement, they’re like, ‘OK, that’s 100 years from now,’” Bean noted.

From MarketWatch ● Oct. 26, 2026

The ninth pitch was over the plate—and Frelick sent it soaring over the center-field fence, erasing a Tampa Bay lead that might have been insurmountable for anyone else.

From The Wall Street Journal ● Oct. 25, 2026

The ninth person, Mohammed al-Qasous, will be buried on Monday, his family said.

From Barron's ● Oct. 25, 2026

And when fall came I’d be off to ninth grade at a new school by myself—because Jennifer went to Marlborough in Hancock Park.

From "It All Comes Down to This" by Karen English

Sofia has had three first place wins, a third, two fifths and two ninths.

From Time Magazine Archive

Other than wins, Sofia has had a third, two fifths and two ninths.

From Time Magazine Archive

Jagged with octave jumps, hard-to-land-on intervals of sevenths and ninths, and grinding dissonances, his high-tensioned 70-minute song cycle was even more difficult to sing than to listen to.

From Time Magazine Archive

They only babbled of theme and counter-theme, of harmonies and resultant sounds, of consecutive ninths and tierce major.

From Jean Christophe: in Paris The Market-Place, Antoinette, the House by Gilbert Cannan

In this manner there were formed intervals of thirds, 3:2, of fourths, 4:3, and of ninths, 9:8.

From Timaeus by Benjamin Jowett

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