eighth

noun

ˈātth 

ˈāth

plural eighths ˈāt(th)s 

ˈāths

1

: one that is number eight in a series

the eighth of the month

see Table of Numbers

2

: one of eight equal parts of something

one eighth of a pie

an eighth of a pound

3

: eighth note

4

: octave

He contrasted himself with Elton John, who complained that his chubby hands could only reach an eighth, which was a hindrance to his piano technique (though clearly he overcame the problem).

—Susan Wyndham

eighth adjective or adverb

the eighth person in line

the country's eighth largest city

Examples of eighth in a Sentence

one eighth of the pie

An eighth of a pound is two ounces.

Recent Examples on the Web

The 50 works Sotheby’s is selling now represent roughly one-eighth of the collection by number, while the remaining 350 works are intended to become the foundation of the university’s new museum. — Daniel Cassady, ARTnews.com, 14 Sep. 2026

Pinch-hitter Owen Caissie's sacrifice fly tacked on another run for the Marlins in the eighth. — CBS News, 12 Sep. 2026

Their findings reduced uncertainty in X-ray energies by between one-third and one-eighth compared with earlier results. — Georgina Jedikovska, Interesting Engineering, 11 Sep. 2026

Before the ban, at least seven-eighths of all spirits made in the country were not being taxed, according to the government. — Maureen Groppe, USA Today, 30 Aug. 2026

Word History

First Known Use

1557, in the meaning defined at sense 2

Phrases Containing eighth

• eighth note
• eighth rest

Kids Definition

eighth

noun

ˈātth 

plural eighths ˈāt(th)s 

: one that is number eight in a series see number

eighth adjective or adverb