fifth

noun

ˈfith  ˈfif(t)th 

ˈfift

plural fifths ˈfiths 

ˈfif(t)ths,

ˈfif(t)s

1

: one that is number five in a series

Payment is due on the fifth of the month.

see Table of Numbers

2

: one of five equal parts of something

spent a fifth of their income on rent

3

a

: the musical interval embracing five diatonic degrees

b

: a tone at this interval

specifically : dominant sense 1

c

: the harmonic combination of two tones at this interval

4

: a unit of measure for liquor equal to one fifth of a U.S. gallon (0.757 liter)

5

the Fifth : the Fifth Amendment of the U.S. Constitution

also : the right accorded by the Fifth Amendment to refuse to testify against oneself see also plead the Fifth, take the Fifth

fifth adjective or adverb

the fifth annual food festival

She finished fifth in the race.

fifthly adverb

Fourthly, it takes a lot of concrete to make a nuclear power plant. Fifthly, there is no place to put the waste that is safe.

—Victor Odlivak

Examples of fifth in a Sentence

The bill is due on the fifth of each month.

She donated a fifth of her income to charity.

bought a fifth of whiskey

Recent Examples on the Web

The figure includes 21 million barrels per day of crude oil and products, or a fifth of the world’s supply. —Gaurav Sharma, Forbes.com, 22 June 2025

Cathedral scored four runs in the fourth against freshman pitcher Jillian DeYoung, who continued to excel in the circle and also had one of the Wildcats’ four hits, and added a run in the fifth. —Michael Osipoff, Chicago Tribune, 15 June 2025

The lead, however, didn’t last long as the Mets scored five unanswered, headlined by Starling Marte’s two-run single in the fifth that made the score 5-1. —Fiifi Frimpong, The Orlando Sentinel, 14 June 2025

After the bill's tax and spending cuts, an analysis by the Penn Wharton Budget Model found, the poorest fifth of American households earning less than $17,000 a year would see their incomes drop by $820 next year. —Arkansas Online, 8 June 2025

Word History

Etymology

Middle English fifte, fifthe, from Old English fīfta, from fīf five

First Known Use

1557, in the meaning defined at sense 2

Phrases Containing fifth

• fifth column
• fifth disease
• fifth wheel
• plead the fifth

Kids Definition

fifth

noun

ˈfith  ˈfif(t)th 

1

: one that is number five in a series see number

2

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

fifth adjective or adverb

fifthly adverb