Retrogression
[re-truh-gresh-uh n] /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.
retrogression ret·ro·gres·sion (rět’rə-grěsh’ən)
n.
The act or process of deteriorating or declining.
A return to a less complex biological state or stage.
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