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

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

Example Sentences

See Examples For:

ninth ninths

Turner and his peers originally drew inspiration from San Diego’s book crawl, which just had its ninth anniversary.

From Los Angeles Times ● Jul. 21, 2026

China put some of its most promising AI tech on show at the ninth edition of the country’s flagship annual AI conference, which ended on Monday.

From The Wall Street Journal ● Jul. 21, 2026

Betts, who went four for five, hit two home runs — a solo shot in the seventh and a two-run blast in the ninth.

From Los Angeles Times ● Jul. 21, 2026

Racing Bulls' British rookie Arvid Lindblad was ninth with Alpine's Franco Colapinto taking the final point in 10th.

From BBC ● Jul. 19, 2026

If maybe it’s because he’s in ninth grade, just old enough to be at the edge of my abilities.

From "Clairboyance" by Kristiana Kahakauwila

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

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

In the Fifth Gift the child sees three and its multiples; in fractions, halves, quarters, eighths, thirds, ninths, and twenty-sevenths.

From Children's Rights A book of nursery logic by Wiggin, Kate Douglas Smith

Our ninths in oil, but not in water.

From Harper's Young People, September 28, 1880 An Illustrated Weekly by Various