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

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

• ninthly adverb

Etymology

Origin of ninth

before 900; Middle English ninthe ( 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

Corona del Mar 3, Los Alamitos 2: A sacrifice fly in the bottom of the ninth by Brady Zenz gave Corona del Mar the walk-off victory.

From Los Angeles Times • Apr. 14, 2026

I was born in 1987, the ninth year of Deng Xiaoping’s economic transformation of China, in Nanhuzhuang Village, Henan Province.

From The Wall Street Journal • Apr. 13, 2026

Vachon was also the one who took Robitaille with the 171st pick, in the ninth round of the 12-round 1984 draft — and even then it was considered a gamble.

From Los Angeles Times • Apr. 12, 2026

Goldman Sachs is raising $13 billion for its ninth GS Mezzanine Partners fund.

From Barron's • Apr. 8, 2026

I loved that her lesson plans were the same ones used for ninth grade in the public high school I would have attended.

From "Courage to Soar" by Simone Biles