Liberal Dictionary English Dictionary
noun
- the act of retrogressing; movement backward.
- Biology. degeneration; retrograde metamorphosis; passing from a more complex to a simpler structure.
1640s, noun of action, formed on model of progression, from Latin retrogressus, past participle of retrogradi “move backward” (see retrograde).
n.
- The act or process of deteriorating or declining.
- A return to a less complex biological state or stage.