Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun retrogression

2 senses of retrogression

Sense 1
degeneration, retrogression -- (passing from a more complex to a simpler biological form)
       => transformation, transmutation, shift -- (a qualitative change)

Sense 2
regression, regress, reversion, retrogression, retroversion -- (returning to a former state)
       => reversal -- (a change from one state to the opposite state; "there was a reversal of autonomic function")