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

Leaping high, six yards out, to nod in Tommy Conway's cross from the left wing, Will Lankshear notched his ninth goal in 12 games for Middlesbrough.

From BBC ● Oct. 12, 2026

To become champion in Austin, he would need to win the race with Russell finishing ninth or lower and Hamilton fifth or lower.

From BBC ● Oct. 11, 2026

Antonelli's lead over team-mate George Russell, who finished ninth after starting from the back of the grid, has extended to 102 points and 111 over Hamilton.

From BBC ● Oct. 11, 2026

In the ninth, Max Muncy added an insurance run with his third home run of the series.

From Los Angeles Times ● Oct. 8, 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

There are sevenths and ninths in music, beautiful and effective in their degrees; but perhaps none of them are so absolutely satisfying to the ear as the perfect chord.

From A Romance of Two Worlds by Marie Corelli

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 Kate Douglas Smith Wiggin