LATIN DICTIONARYLexicon Latīnum
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“fortification” in Latin

The English word fortification itself goes back to Latin fortis, through fortificatio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

fortification
A fortified place, locus munitus (general term for any fortified place): arx (the citadel): castellum: castrum (if a height that commands the surrounding country; a fort): propugnaculum (any work that serves to ward off the attack of an enemy). A natural fortification, locus natura or naturaliter munitus; castellum natura munitum: a strong fortification, oppidum munitissimum or maximis operibus munitum; opere et natura egregie munitus locus; oppidum operibus et natura munitum (if strong from nature and by art): to demolish a fortification, munimenta oppidi solo aequare (or adaequare); castrum diruere: fortifications, operis munitio; opus (or opera) munitionesque; also, munitiones only; munimenta, orum; opera, um, or (of a town = its walls) moenia, ium: the throwing up of fortifications, munitio; communitio.
Act of fortifying, munitio: communitio: the art of fortifying, ars muniendi; *architectura militaris; *ars muniendi.

Quick answer

What is the Latin word for fortification?
The usual Latin words for “fortification” are arx, castellum, castrum; also prōpugnāculum, mūnītiō, commūnītiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.