Dictionary![]() ![]() se•da•tionPronunciation: (si-dā'shun), [key] —n. Med. 1. the calming of mental excitement or abatement of physiological function, esp. by the administration of a drug. 2. the state so induced. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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