a fortified military post where troops are stationed
source: WordNet 3.0
a fortified defensive structure
source: WordNet 3.0
A strong or fortified place; usually, a small fortified place, occupied only by troops, surrounded with a ditch, rampart, and parapet, or with palisades, stockades, or other means of defense; a fortification.
source: Webster 1913
verb
gather in, or as if in, a fort, as for protection or defense
