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retardation

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re⋅tar⋅da⋅tion

  [ree-tahr-dey-shuhn]
Use retardation in a Sentence
–noun
1. the act of retarding or state of being retarded.
2. something that retards; hindrance.
3. slowness or limitation in intellectual understanding and awareness, emotional development, academic progress, etc.
4. Music. a form of suspension that is resolved upward.
Also, re⋅tard⋅ment  [ri-tahrd-muhnt] .

Origin:
1400–50; late ME retardacioun < L retardātiōn- (s. of retardātiō), equiv. to retardāt(us) (see retard, -ate 1 ) + -iōn- -ion

Related forms:
re⋅tard⋅a⋅tive  [ri-tahr-duh-tiv] , re⋅tard⋅a⋅to⋅ry  [ri-tahr-duh-tawr-ee, -tohr-ee] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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re·tar·da·tion   (rē'tär-dā'shən)   
n.  

    1. The act or process of retarding.

    2. The condition of being retarded.

  2. The extent to which something is held back or delayed.

  3. Something that retards; a delay or hindrance.

  4. Mental retardation.

  5. Music A diminishing of tempo; a retard.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

retardation 
1426, "fact or action of making slower in movement or time," from L. retardationem, from retardare "to make slow, delay, keep back, hinder," from re-, intensive prefix, + tardare "to slow" (see tardy). Retarded "mentally slow" first recorded 1895. Retard (v.) first recorded 1489, from O.Fr. retarder (13c.); offensive noun meaning "stupid person" (with accent on first syllable) is from 1960s slang.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: re·tar·da·tion
Pronunciation: "rE-"tär-'dA-sh&n, ri-
Function: noun
1 : an abnormal slowness of thought oraction; also : less than normal intellectual competence usually characterized by an IQ of less than 70 retardation>
2 : slowness in developmentor progress
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

retardation re·tar·da·tion (rē'tär-dā'shən)
n.

  1. The condition of being relatively slow in mental, emotional, or physical development.

  2. The extent to which something is held back or delayed.

  3. Mental retardation.

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