donjon/ˈdʌn.d͡ʒən/EtymologyA variant of dungeon remodelled on its etymon, Old French donjon.donjon means the fortified tower and main residence of a motte or early castle; a keep. Lexicurio rates it Distinctive — a strength score of 66 out of 100.nounThe fortified tower and main residence of a motte or early castle; a keep.“It was a fortress of no great size, consisting of a donjon, or large and high square tower, surrounded by buildings of inferior height, which were encircled by an inner court-yard.”