1580s, "fortress commanding a city," from Middle French citadelle (15c.), from Italian cittadella, diminutive of Old Italian cittade "city" (Modern Italian citta), from Latin civit [..]

A fortress, or stronghold, in or near a fortified city. The citadel was intended to command the city and its fortifications, but could also be used as a final point of defense into which people could [..]

n. Any strong fortress.

TCP IP port numbers 504/tcp citadel

(n) a stronghold into which people could go for shelter during a battle

in fortification, a small strong fort, constructed either within the place fortified, or on the most inaccessible spot of its general outline; to give refuge for the garrison, that it may prolong the [..]

Operational code name for the German attack on the Soviet forces near Kursk, July 1943

Highly protected area of the ship, usually amidships under main tower/turrets, housing vital modules where if penetrated you will do massive amounts of damage.

A dated term referring to any property used for Salvation Army worship. Similar in usage to the terms 'fortress' and 'temple'. In a similar vein, 'quarters' (still in com [..]