Regressive vs Retrogressive - What's the difference?

As adjectives the difference between regressive and retrogressive

is that regressive is that tends to return, revert or regress while retrogressive is of or relating to retrogression.

(en adjective)

That tends to return, revert or regress.

(of a tax) Whose rate decreases as the amount increases.

* progressive

* * * ----

(en adjective)

Of or relating to retrogression

Directed towards the rear or the past; retrograde