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sedation (n.)

early 15c., "alleviation of pain;" 1540s, "act of making calm," from Middle French sédation and directly from Latin sedationem (nominative sedatio) "a quieting, assuaging, a calming," noun of action from past participle stem of sedare (see sedate (adj.)).

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Definitions of sedation from WordNet

sedation (n.)
a state of reduced excitement or anxiety that is induced by the administrative of a sedative agent;
sedation (n.)
the administration of a sedative agent or drug;
Synonyms: drugging
From wordnet.princeton.edu