citadel
Americannoun
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a fortress that commands a city and is used in the control of the inhabitants and in defense during attack or siege.
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any strongly fortified place; stronghold.
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(formerly) a heavily armored structure on a warship, for protecting the engines, magazines, etc.
noun
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a stronghold within or close to a city
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any strongly fortified building or place of safety; refuge
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a specially strengthened part of the hull of a warship
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(often capital) the headquarters of the Salvation Army
Other Word Forms
Noun Inflected Forms
Etymology
Origin of citadel
1580–90; < Middle French citadelle < Old Italian cittadella, equivalent to cittad ( e ) city + -ella -elle
Explanation
A citadel is a fortified structure designed to provide protection during a battle. So, back in the days when pillaging was commonplace, it was a good idea to know where your nearest citadel was. Among the most historically famous citadels are the Acropolis in Athens and the Tower of London. Even though we're building fewer physical fortresses these days, citadel remains a useful word, particularly when you need to create a metaphor suggesting strength and safety. As poet John Keats wrote, "[I]t appears to me that almost any man may like the spider spin from his own inwards his own airy citadel."
Vocabulary lists containing citadel
"The Odyssey" by Homer, Books 8–13
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A Thousand Splendid Suns
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Beowulf vocabulary
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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.
Citadel executes roughly 35% of all retail order volume in the U.S., making it the largest market maker trading against this cohort.
From MarketWatch • Jul. 1, 2026
In the U.S. he worked at Fidelity Investments and Citadel before joining Welltower’s finance division in 2016.
From The Wall Street Journal • Jun. 29, 2026
“Retail cash equity volumes ran 60% above the 2025 average and more than twice the 2024 average in May,” Citadel said.
From Barron's • Jun. 23, 2026
Citadel Securities strategist Scott Rubner says one of the most important two weeks of the year is here, and that could open buying opportunities for stocks.
From The Wall Street Journal • Jun. 19, 2026
He would need to find someone to tend the birds until the Citadel sent a man to replace Pycelle.
From "A Clash of Kings" by George R.R. Martin
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
