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

Hyo Joo Kim doubled her lead to four strokes Friday in the Fortinet Founders Cup, capping a late afternoon rally with a 6-foot birdie putt on the par-3 eighth. —ABC News, 21 Mar. 2026

Garrett Whitlock pitched a perfect eighth. —Jordan McPherson, Miami Herald, 16 Mar. 2026

Sam Cozart struck out two Rebels in a clean eighth. —David Eckert, Austin American Statesman, 15 Mar. 2026

Similar advice is given for internal combustion engine, or ICE, vehicles going below one-eighth of a tank of gas. —Adam L. Neal, USA Today, 9 Mar. 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