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Retrogression is a 13 letter word which starts with the letter R and ends with the letter N for which we found 2 definitions.

(n.) The act of retrograding or going backward; retrogradation.
(n.) 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.
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