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[re-truh-gresh-uh n] /ˌrɛ trəˈgrɛʃ ən/
the act of retrogressing; movement backward.
Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
Origin of retrogression
1640-50; < Latin retrōgress(us) (see retrogress) + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for retrogression
  • 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.
  • The change to less desirable plants is called plant retrogression.
Word Origin and History for retrogression

1640s, noun of action, formed on model of progression, from Latin retrogressus, past participle of retrogradi "move backward" (see retrograde).

Online Etymology Dictionary, © 2010 Douglas Harper
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retrogression in Medicine

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

  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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