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

Senior quarterback Tyler Langford (12-for-27, 115 passing yards) led the Rockets on an 18-play drive that began late in the first quarter and chewed up most of the second, running to convert one fourth down and completing a pass to Jacob Heckman to convert a second. —Matt Goisman, Boston Herald, 27 Nov. 2025

TikTok is the central engine of discovery, especially for Gen Z and millennial shoppers, who account for roughly three-fourths of K-beauty consumers, according to a Personal Care Insights market analyst report. —Luke Fountain, CNBC, 27 Nov. 2025

The Suns led 83-73 going into the fourth. —Jason Anderson, Sacbee.com, 27 Nov. 2025

Three-fourths said digital cash flow visibility and liquidity management solutions have revolutionized their growth strategies, but adoption remains low, according to the findings. —Sheryl Estrada, Fortune, 26 Nov. 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