retrogression

[re-truh-gresh-uhn]
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; < Latin retrōgress(us) (see retrogress) + -ion

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World English Dictionary
retrogress (ˌrɛtrəʊˈɡrɛs)
 
vb
1.  to go back to an earlier, esp worse, condition; degenerate or deteriorate
2.  to move backwards; recede
3.  biology to develop characteristics or features of lower or simpler organisms; degenerate
 
[C19: from Latin retrōgressus having moved backwards, from retrōgradī; see retrograde]
 
retro'gression
 
n
 
retro'gressive
 
adj
 
retro'gressively
 
adv

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Etymonline
Word Origin & History

retrogression
1646, formed on model of progression from L. retrogressus, pp. of retrogradi "move backward" (see retrograde).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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Example sentences
Visa retrogression affects both the adjusted age calculation and the one year
  filing requirement.
Retrogression is particularly possible near the end of the fiscal year as visa
  issuance approaches the annual limitations.
Moreover, in some categories cut-off date retrogression is a possibility.
Moreover, in some categories cut-off date retrogression is a particular
  possibility.
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