eighth

American  

[eytth, eyth] / eɪtθ, eɪθ /

adjective

1. next after the seventh.

2. being one of eight equal parts.

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noun

1. an eighth part, especially of one (⅛).

2. the eighth member of a series.

3. Music. octave.

adverb

1. in the eighth place; eighthly.

eighth British  

/ eɪtθ /

adjective

1. (usually prenominal)

   1. coming after the seventh and before the ninth in numbering or counting order, position, time, etc; being the ordinal number of eight: often written 8th

   2. ( as noun )

      the eighth in line

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noun

1. 1. one of eight equal or nearly equal parts of an object, quantity, measurement, etc

   2. ( as modifier )

      an eighth part

2. the fraction equal to one divided by eight ( 1/ 8 )

3. another word for octave

adverb

1. Also: eighthly.  after the seventh person, position, event, etc

Etymology

Origin of eighth

before 1000; Middle English eightethe, Old English eahtotha; cognate with Old High German ahtoda, Old Norse āttandi, Gothic ahtud-. See eight, -th ²

Example Sentences

Okay, the eighth email in your inbox is from Priscilla again, sent on February 26th, 2026.

From The Wall Street Journal • Apr. 14, 2026

Pereira, who runs the financial tech company, says his longevity offers a glimpse to his own adult sons about what life can be like in their eighth decade.

From The Wall Street Journal • Apr. 13, 2026

The stock closed up 2.6% in Friday’s trading session, closing higher for an eighth consecutive trading session.

From Barron's • Apr. 13, 2026

“It was tricky. I was moving fast, clipped the eighth hurdler and lost my balance. That’s never happened to me before.”

From Los Angeles Times • Apr. 13, 2026

In August 1911, Lydia Zvereva became the eighth woman in the world—and the first woman in Russia—to get a pilot's license.

From "A Thousand Sisters" by Elizabeth Wein