ninth

noun

ˈnīn(t)th 

plural ninths ˈnīn(t)s 

ˈnīn(t)ths

1

: one that is number nine in a series

They're leaving on the ninth.

The batter hit a home run in the bottom of the ninth.

see Table of Numbers

2

: one of nine equal parts of something

She owned a ninth of the company.

3

a

: a musical interval embracing an octave and a second

b

: the tone at this interval

c

: a chord containing a ninth

ninth adjective or adverb

the ninth day of the month

the book's ninth edition

He finished ninth in the race.

Examples of ninth in a Sentence

Recent Examples on the Web

Raisel Iglesias pitched a perfect ninth for his 33rd save in 36 chances. — CBS News, 16 Sep. 2026

Gabriel Moreno opened the Arizona ninth with a walk off Pete Fairbanks, who left due to an apparent injury after throwing a first-pitch ball to Geraldo Perdomo. — Miami Herald, 15 Sep. 2026

Kodai Senga pitched a perfect ninth for his sixth save in six chances. — ABC News, 6 Sep. 2026

Word History

First Known Use

13th century, in the meaning defined at sense 2

Phrases Containing ninth

• ninth cranial nerve

Kids Definition

ninth

noun

ˈnīn(t)th 

plural ninths

: one that is number nine in a series see number

ninth adjective or adverb