Noun retrogression has 2 senses
  1. degeneration, retrogression - passing from a more complex to a simpler biological form
    --1 is a kind of transformation, transmutation, shift
    --1 has particulars: abiotrophy; cataplasia
  2. regression, regress, reversion, retrogression, retroversion - returning to a former state
    --2 is a kind of reversal
    Derived form: verb retrogress1
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