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 ( 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

Mock, who reread The Lord of the Rings every year from fourth grade through ninth grade, has simpler dreams: “a hobbit hole out in the countryside, and as little as possible.”

From Slate • May 28, 2026

In the ninth, Adrian Lopez and Augie Lopez managed to score runs for USC, taking a 5-4 lead.

From Los Angeles Times • May 24, 2026

It was Maeda's 17th goal of the season and his ninth goal in his last seven.

From BBC • May 23, 2026

Jeff McNeil hit a tying homer in the ninth and Tyler Soderstrom had an RBI single in the 10th to rally the A’s past the Angels.

From Los Angeles Times • May 23, 2026

“Solve two of these mathematically inspired picture puzzles before any of the other teams and you will earn our ninth medal, the Rebus!”

From "Mr. Lemoncello's Library Olympics" by Chris Grabenstein