eighteenth

American  

[ey-teenth] / ˈeɪˈtinθ /

adjective

1. next after the seventeenth; being the ordinal number for 18.

2. being one of 18 equal parts.

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noun

1. an eighteenth part, especially of one (1/18).

2. the eighteenth member of a series.

Etymology

Origin of eighteenth

before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th ²

Example Sentences

The Dow Jones Industrial Average reached 48,500 points, marking its eighteenth record high of the year, reflecting market optimism.

From Barron's • Dec. 11, 2025

"Since women had no political position in the eighteenth century, I could not place this debate there," Wills told Salon.

From Salon • Oct. 11, 2024

On that measure, Migration Observatory calculations based on data from the European statistics agency Eurostat for 2022 puts the UK eighteenth out of the 32 European countries included.

From BBC • Oct. 25, 2023

The scrolls were discovered in the eighteenth century, when workmen came across the remains of a luxury villa that might have belonged to the family of Julius Caesar’s father-in-law.

From Scientific American • Oct. 17, 2023

Maybe I could study the eighteenth century in secret.

From "The Bell Jar" by Sylvia Plath