Synonyms: retrogression, retroversion, reversion, regress, regression
Definition: returning to a former state
Similar words: reversal
Definition: a change from one state to the opposite state
Usage: there was a reversal of autonomic function
Synonyms: retrogression, degeneration
Definition: passing from a more complex to a simpler biological form
Similar words: shift, transformation, transmutation
Definition: a qualitative change