1. The act of calming, especially by the administration of a sedative. 2. The state of being calm. [L. sedatio, to calm, allay]
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se·da·tion si-'dā-shən n
1) the inducing of a relaxed easy state esp. by the use of sedatives
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n.
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se·da·tion (sə-daґshən) [L. sedatio] the production of a sedative effect; the act or process of calming.Medical dictionary. 2011.