Early 14 c., from Old French forteresce ("strong place, fortification") , variant of fortelesse, from Medieval Latin fortalitia, from Latin fortis ("strong") (see fort)-itia, added to adjectives to form nouns of quality or condition. French -ess, from Latin -itia is also in words such as duress, largesse and riches. For change of medial -l- to -r- in Old French, compare orne from ulmus; chartre from cartula and chapitre from capitulum.
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