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
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
But Indiana took control from then onwards, going on a huge 19-0 run in the third quarter before 10 points from Mitchell in the fourth helped round out the win.
—Jamie Barton, CNN Money, 15 June 2025
Houston scored three runs in the first inning, all of which came with a pair of outs, two more in the second, another three in the third and one in the fourth.
—Betsy Helfand, Twin Cities, 14 June 2025
The Pacers carried an 87-80 advantage into the fourth.
—Joe Vardon, New York Times, 14 June 2025
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Perry recently sold out three shows in Mexico and ended up adding a fourth.
—Daniela Avila, People.com, 13 June 2025
See All Example Sentences for fourth
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Jamie Barton, CNN Money, 15 June 2025
Houston scored three runs in the first inning, all of which came with a pair of outs, two more in the second, another three in the third and one in the fourth.
—Betsy Helfand, Twin Cities, 14 June 2025
The Pacers carried an 87-80 advantage into the fourth.
—Joe Vardon, New York Times, 14 June 2025
Related Stories Katy Perry and Orlando Bloom's Relationship Timeline
Katy Perry Shares the No. 1 Rule That Keeps Her Relationship with Orlando Bloom Going Strong (Exclusive)
Perry recently sold out three shows in Mexico and ended up adding a fourth.
—Daniela Avila, People.com, 13 June 2025
See All Example Sentences for fourth
Cite this Entry
“Fourth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fourth. Accessed 19 Jun. 2025.
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