[sit-uh-dl, -uh-del]
a fortress that commands a city and is used in the control of the inhabitants and in defense during attack or siege.
any strongly fortified place; stronghold.
(formerly) a heavily armored structure on a warship, for protecting the engines, magazines, etc.

1580–90; < Middle French citadelle < Old Italian cittadella, equivalent to cittad(e) city + -ella -elle Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
citadel (ˈsɪtədəl, -ˌdɛl)
1.  a stronghold within or close to a city
2.  any strongly fortified building or place of safety; refuge
3.  a specially strengthened part of the hull of a warship
4.  (often capital) the headquarters of the Salvation Army
[C16: from Old French citadelle, from Old Italian cittadella a little city, from cittade city, from Latin cīvitās]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1586, "fortress commanding a city," from It. cittadella, dim. of cittade "city," from L. civitatem (see city).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Indeed, since the citadel collapsed into a natural underground cistern.
The flames of his burning citadel reached the eyes of the unfortunate monarch
  during his flight and he expired with grief.
Citadel, another big hedge fund, opted to raise capital recently via the bond
The plant still stands but the celebrated mud-brick citadel was ruined in the
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