subluxation Syllabification: (sub·lux·a·tion)Pronunciation: /ˌsəbləkˈsāSHən/Definition of subluxation noun Medicine a partial dislocation. a slight misalignment of the vertebrae, regarded in chiropractic theory as the cause of many health problems. Origin: late 17th century: from modern Latin subluxatio(n-) (see sub-, luxate)subluxation in other Oxford dictionaries Definition of subluxation in the British & World English dictionary