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.

1640–50; < Latin sēdātus (past participle of sēdāre to allay, quieten); akin to sedēre to sit1

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. 2014.
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World English Dictionary
sedate1 (sɪˈdeɪt)
1.  habitually calm and composed in manner; serene
2.  staid, sober, or decorous
[C17: from Latin sēdāre to soothe; related to sedēre to sit]

sedate2 (sɪˈdeɪt)
(tr) to administer a sedative to
[C20: back formation from sedative]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1663, from L. sedatus "composed, moderate, quiet, tranquil," pp. of sedare "to settle, calm," causative of sedere "to sit" (see sedentary). The verb meaning "treat with sedatives" is a 1945 back-formation from the noun derivative of sedative (adj.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
They also had plenty of info, good spirit, and beer to keep us sedate.
Sedate biographers are apt to regard such whims as unimportant.
Development may be moving at a more sedate pace for the time being.
They arrange for him to make his relatively sedate second video.
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