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Definition of: fortress

(fôr′tris) noun
A large permanent fort; a stronghold; castle. See synonyms under DEFENSE, FORTIFICATION.
—v.t. To furnish or strengthen with a fortress; fortify. [<OF forteresse <L fortis strong]

Most often used phrases:

flying fortress
fortress press
team fortress
dimension fortress
fortress macross
fortress maximus
medieval fortress
fortress built
augsburg fortress
mountain fortress
akershus fortress
fortress infantry
paul fortress
fortress heavy
ancient fortress

'fortress' used in million biggest domains list by Alexa.com:

teamfortress.com
themefortress.com
fortressfunds.net
fortress-design.com
snowfortress.net
dwarffortresswiki.org

'fortress' used in other domains:

fortress-jp.com
amightyfortressisourgod.com
b29superfortress.com
fortresscapitalgroup.com
fortressbuilderscolorado.com
inthefortress.com

Statistical data

"fortress" has the frequency of use of 0.0001% on city-data.com forum

"fortress" has the frequency of use of 0.0018% on en.wikipedia.org.