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retrogression

retrogression Retrogression is a historical term for change from a more complex and complete form to a simpler or more incomplete one.

Retrogression is a historical term for change from a more complex and complete form to a simpler or more incomplete one. In the supplied source, it refers to biological degeneration, including cases where later forms lose structures present in earlier ones.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Degeneration (in biology)” (Degeneration (in biology)).
public-domain-US · Source snapshot SHA-256: 08d41be0452624d395f90f1dd42283fbb21304db9914d3e91ed61f0786ef092b

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “retrogression.” Development preview.

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