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retrogression

American  
[re-truh-gresh-uhn] / 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.

Etymology

Origin of retrogression

1640–50; < Latin retrōgress ( us ) ( retrogress ) + -ion

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.