fourth

noun

ˈfȯrth 

plural fourths ˈfȯr(th)s 

1

: one that is number four in a series

I was the fourth to arrive.

They arrive on the fourth. [=the fourth day of the month]

see Table of Numbers

2

: one of four equal parts of something : quarter entry 1

Cut the cake into fourths.

a fourth of the population

3

a

: a musical interval (see interval sense 2) embracing four tones of the diatonic scale

b

: a tone at this interval

specifically : subdominant sense 1

c

: the harmonic combination of two tones a fourth apart

4

: the fourth forward gear or speed of a motor vehicle

shifted into fourth

5

the Fourth : July 4 observed as a legal holiday in the U.S. in commemoration of the adoption of the Declaration of Independence in 1776 : Fourth of July

watched fireworks on the Fourth

called also Independence Day

fourth adjective or adverb

the fourth edition of a book

the fourth tallest mountain

fourthly adverb

Fourthly, don't sing a whole opera through …

—Mark Twain

Examples of fourth in a Sentence

cut the cake into fourths

She drank a fourth of the bottle.

Recent Examples on the Web

Robert singled, stole second, advanced to third on an error and scored on a single by Colson Montgomery, extending the Sox lead to 5-1 in the fourth. —Lamond Pope, Chicago Tribune, 20 July 2025

After hitting Jonathan India with a pitch to start the game, Junk settled in and retired nine straight before Bobby Witt Jr. doubled to center with one out in the fourth. —Steve Gorten, Miami Herald, 20 July 2025

Although Orlando was able to regain its lead in the third quarter and was ahead by 2 entering the fourth. —Jason Beede, The Orlando Sentinel, 14 July 2025

Queta, who projects as the top option at this early stage, made 62 appearances and six starts in his first season as a full-time NBA player, but the 26-year-old was a distant fourth on the depth chart behind Porzingis, Horford and Kornet by the end of 2024. —Zack Cox, Boston Herald, 13 July 2025

Word History

Etymology

see four

First Known Use

1594, in the meaning defined at sense 2

Phrases Containing fourth

• a poor second/third/fourth
• fourth dimension
• fourth estate
• fourth trimester
• fourth wall
• fourth world
• sixty-fourth note
• sixty-fourth rest

Rhymes for fourth

• henceforth
• thenceforth

Kids Definition

fourth

noun

ˈfō(ə)rth 

ˈfȯ(ə)rth

1

: one that is number four in a series see number

2

: the difference in pitch between the first tone and the fourth tone of a scale

fourth adjective or adverb

fourthly adverb