retrogressions'

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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