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

Gabe Speier pitched two-thirds of an inning before Muñoz came in with two outs in the eighth. — ABC News, 1 Aug. 2026

The Rays won despite being limited to five hits by four Sox pitchers — a single in the fourth by Yandy Díaz, the singles by DeLuca and Fortes in the fifth and singles by Díaz and Chandler Simpson in the eighth. — Lamond Pope, Chicago Tribune, 1 Aug. 2026

The researchers used the chip to reconstruct a satellite image of a tropical storm while transmitting only about one-eighth of the original data. — Georgina Jedikovska, Interesting Engineering, 30 July 2026

The proposal would increase the county’s sales tax by three-eighths of a cent to fund wildfire prevention, fire protection and healthcare access, with 50% of net revenues slated for local hospitals. — Corey Schmidt, Sacbee.com, 18 July 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