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

oversedation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sedation (sɪˈdeɪʃən)
1.  a state of calm or reduced nervous activity
2.  the administration of a sedative

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1543, from L. sedationem (nom. sedatio), from sedare (see sedate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
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.
Image for sedation
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