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Webster 1913 Edition
Retrogression
1.
The act of retrograding, or going backward; retrogradation.
2.
(Biol.)
Backward development; a passing from a higher to a lower state of organization or structure, as when an animal, approaching maturity, becomes less highly organized than would be expected from its earlier stages or known relationship. Called also
retrograde development
, and regressive metamorphism
. Webster 1828 Edition
Retrogression
RETROGRES'SION
,Noun.
Definition 2024
rétrogression
rétrogression
See also: retrogression