retrogression

[re-truh-gresh-uh n]
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noun
  1. the act of retrogressing; movement backward.
  2. Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.

Origin of retrogression

1640–50; < Latin retrōgress(us) (see retrogress) + -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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Word Origin and History for 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

retrogression in Medicine

retrogression

[rĕt′rə-grĕshən]
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.