Etymology
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fort (n.)

mid-15c., "fortified place, stronghold," from Old French fort "fort, fortress; strong man," noun use of adjective meaning "strong, stout, sturdy; hard, severe, difficult; hard to understand; dreadful, terrible; fortified" (10c.), from Latin fortis "strong, mighty; firm, steadfast; brave, spirited," from Old Latin forctus, which is of unknown etymology. Possibly from PIE root *bhergh- (2) "high, elevated," with derivatives referring to hills and hill-forts, or possibly from *dher- "to hold firmly, support." Figurative use of hold the fort attested from 1590s.

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Definitions of fort
1
fort (v.)
gather in, or as if in, a fort, as for protection or defense;
Synonyms: fort up
fort (v.)
enclose by or as if by a fortification;
Synonyms: fortify
fort (v.)
station (troops) in a fort;
2
fort (n.)
a fortified military post where troops are stationed;
Synonyms: garrison
fort (n.)
a fortified defensive structure;
Synonyms: fortress
From wordnet.princeton.edu