Definition of exact verb from the Oxford Advanced American Dictionary
exact
verb
/ɪɡˈzækt/
(formal)1exact something (from someone)to demand and get something from someoneShe was determined to exact a promise from him.2to make something bad happen to someoneexact somethingHe exacted (= took) terrible revenge for their treatment of him.exact something from someoneStress can exact a high price from workers (= can affect them badly).exaction