eighteenth
Americanadjective
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next after the seventeenth; being the ordinal number for 18.
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being one of 18 equal parts.
noun
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eighteenths
plural
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an eighteenth part, especially of one (1/18).
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the eighteenth member of a series.
adjective
noun
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one of 18 approximately equal parts of something
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( as modifier )
an eighteenth part
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the fraction that is equal to one divided by 18 ( 1/ 18 )
Other Word Forms
Noun Inflected Forms
Etymology
Origin of eighteenth
before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th 2
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
The samples date from the fourteenth through the eighteenth centuries, covering a large portion of the period known as the Second Plague Pandemic.
From Science Daily ● Sep. 20, 2026
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
Tykes forward Devante Cole poked home from close range for his eighteenth league goal of the season to give the visitors a sixth-minute lead.
From BBC ● Apr. 16, 2024
And maybe I have piqued your interest to learn more about our most rambunctious and raucous festival season that dates back to the eighteenth century.
From Salon ● Feb. 13, 2024
The basic framework for all these institutions and traditions was built in a sudden spasm of enforced inspiration and makeshift construction during the final decades of the eighteenth century.
From "Founding Brothers: The Revolutionary Generation" by Joseph J. Ellis
The faces of the volutes must recede from the edge of the abacus inwards by one and a half eighteenths of that same amount.
From The Ten Books on Architecture by Vitruvius Pollio
As William II himself puts it, this day, like all the "eighteenths" that went before it, has its special significance.
From The Schemes of the Kaiser by Juliette Adam
"There aren't two eighteenths of October in one year."
From A Sheaf of Corn by Mary E. Mann
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
