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[si-dey-shuh n] /sɪˈdeɪ ʃən/
noun, Medicine/Medical.
the calming of mental excitement or abatement of physiological function, especially by the administration of a drug.
the state so induced.
Origin of sedation
1535-45; < Latin sēdātiōn- (stem of sēdātiō), equivalent to sēdāt(us) (see sedate) + -iōn- -ion
Related forms
oversedation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sedation
Contemporary Examples
  • There are benzodiazapine receptors in the brain, but those are the kinds that are sought out for sedation, not sexual excitement.

Historical Examples
British Dictionary definitions for sedation


a state of calm or reduced nervous activity
the administration of a sedative
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sedation

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.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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sedation in Medicine

sedation se·da·tion (sĭ-dā'shən)

  1. Reduction of anxiety, stress, irritability, or excitement by administration of a sedative agent or drug.

  2. The state or condition induced by a sedative.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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