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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.
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. 2014.
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Examples from the web for sedation
  • He came to court in a wheelchair, under heavy sedation.
  • Once she went into respiratory arrest during sedation and had to be revived.
  • Occasionally, forcible sedation was needed to keep the patient from backing out at the last minute.
  • But intubation requires sedation, and many sedating drugs can have unpredictable effects on such an unstable patient.
  • Hypnosis as an alternative to sedation is making a comeback in the operating room.
  • Terminal sedation and pain control are mainstays of hospice and end-of-life care.
  • Doctors touting virtual colonoscopy argue that it's faster and doesn't require sedation.
  • The problem with sedation is that it can make the dog really groggy and thirsty.
  • Only a heavy sedation will reliably prevent awareness and discomfort in a patient undergoing colonoscopy.
  • The health care provider may recommend bed rest, eye patching, and sedation to reduce the likelihood of recurrent bleeding.
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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