Noun
A fortress in or near a fortified city, commanding the city and fortifications, and intended as a final point of defense.
Source: Webster's dictionaryThe consensus seemed to be that if really large numbers of men were sent to storm the mountain, then enough might survive the rocks to take the citadel. This is essentially the basis of all military thinking. Terry Pratchett
The center of every man's existence is a dream. Death, disease, insanity, are merely material accidents, like toothache or a twisted ankle. That these brutal forces always besiege and often capture the citadel does not prove that they are the citadel. G. K. Chesterton
I fear the vermin that shall undermineSenate and citadel and school and shrine. Edwin Markham
Many have original minds who do not think it - they are led away by custom - Now it appears to me that almost any man may like the spider spin from his own inwards his own citadel. John Keats
I was being called to surrender the very citadel of my self. I was completely in the dark. I did not really know what repentance was or what I was required to repent of. It was indeed the turning point of my life. Bede Griffiths
Once you permit those who are convinced of their own superior rightness to censor and silence and suppress those who hold contrary opinions, just at that moment the citadel has been surrendered. Archibald MacLeish