/ sɪˈdeɪʃn; NAmE / noun
[ U ] the act of giving sb drugs in order to make them calm or to make them sleep; the state that results from this :
The victim's wife was last night being kept under sedation in the local hospital.
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WORD ORIGIN
mid 16th cent.: from French sédation or Latin sedatio(n-) , from sedare settle, from sedere sit.