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retrogression

 - 5 dictionary results

ret⋅ro⋅gres⋅sion

  [re-truh-gresh-uhn]
Use retrogression in a Sentence
–noun
1. the act of retrogressing; movement backward.
2. Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
Origin:
1640–50; < L retrōgress(us) (see retrogress ) + -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ret·ro·gres·sion   (rět'rə-grěsh'ən)   
n.  

  1. The act or process of deteriorating or declining.

  2. Biology A return to a less complex or more primitive state or stage.

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

retrogression 
1646, formed on model of progression from L. retrogressus, pp. of retrogradi "move backward" (see retrograde).
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: ret·ro·gres·sion
Pronunciation: "re-tr&-'gresh-&n
Function: noun
: a reversal in development or condition: as a : return to a former and less complex level of development or organization b : subsidence or decline of symptoms or manifestations of a disease
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

retrogression ret·ro·gres·sion (rět'rə-grěsh'ən)
n.

  1. The act or process of deteriorating or declining.

  2. A return to a less complex biological state or stage.

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