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[si-deyt] /sɪˈdeɪt/
calm, quiet, or composed; undisturbed by passion or excitement:
a sedate party; a sedate horse.
verb (used with object), sedated, sedating.
to put (a person) under sedation.
Origin of sedate
1640-50; < Latin sēdātus (past participle of sēdāre to allay, quieten); akin to sedēre to sit1
Related forms
sedately, adverb
sedateness, noun
unsedate, adjective
unsedately, adverb
unsedateness, noun
1. collected, serene, unruffled, unperturbed. See staid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for sedateness
Historical Examples
  • She brought the coffee and the bacon with a sedateness that propriety itself could scarce have surpassed.

    The Virginian Owen Wister
  • Their simplicity, fervor, and sedateness had won his regard.

  • The sedateness of the experienced physician, which no circumstance of this kind can generally disturb, was all gone.

  • She again noticed my sedateness, and inquired into the cause.

    Arthur Mervyn Charles Brockden Brown
  • Murder in Gramercy Park was a novelty which no one aware of its sedateness could comfortably resist.

  • She felt too young for the sedateness into which her life was settling.

    Married Life May Edginton
  • The sedateness of her aspect and her kind compliance in this meeting gave me hopes.

    Clarissa, Volume 6 (of 9) Samuel Richardson
  • I could have endorsed Clovelly's estimate of her so far as her reserve and sedateness were concerned.

    Mrs. Falchion, Complete Gilbert Parker
  • Despite her sedateness she had unmistakably the air of waiting at a tryst.

    The Roll-Call Arnold Bennett
  • The mobile lips were not spread in the gentle smile they knew so well; they were rather studied in their sedateness.

    The Alternative George Barr McCutcheon
British Dictionary definitions for sedateness


habitually calm and composed in manner; serene
staid, sober, or decorous
Derived Forms
sedately, adverb
sedateness, noun
Word Origin
C17: from Latin sēdāre to soothe; related to sedēre to sit


(transitive) to administer a sedative to
Word Origin
C20: back formation from 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 sedateness



"calm, quiet," 1660s, from Latin sedatus "composed, moderate, quiet, tranquil," past participle of sedare "to settle, calm," causative of sedere "to sit" (see sedentary). Related: Sedately.


"treat with sedatives," 1945, a back-formation from the noun derivative of sedative (adj.). The word also existed 17c. in a sense "make calm or quiet." Related: Sedated; sedating.

Online Etymology Dictionary, © 2010 Douglas Harper
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sedateness in Medicine

sedate se·date (sĭ-dāt')
v. se·dat·ed, se·dat·ing, se·dates
To administer a sedative to; calm or relieve by means of a sedative drug.

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