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retrogression

[re-truh-gresh-uh n] /ˌrɛ trəˈgrɛʃ ən/
noun
1.
the act of retrogressing; movement backward.
2.
Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
Origin
1640-1650
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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Word Origin and History for retrogressions'

retrogression

n.

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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retrogressions' in Medicine

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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