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c.1400, originally of bones, from Old French dislocacion (14c.), or directly from Medieval Latin dislocationem (nominative dislocatio), noun of action from past participle stem of dislocare (see dislocate). General sense is from c.1600.
dislocation dis·lo·ca·tion (dĭs'lō-kā'shən)
Displacement of a body part, especially the temporary displacement of a bone from its normal position; luxation.