adj., n., & v.
--adj.
1. directed backwards; retreating.
2 reverting esp. to an inferior state; declining.
3 inverse, reversed (in retrograde order).
4 Astron. in or showing retrogradation.
--n. a degenerate person.
--v.intr.
1. move backwards; recede, retire.
2 decline, revert.
3 Astron. show retrogradation.
Derivatives:
retrogradely adv.
Etymology: ME f. L retrogradus (as RETRO-, gradus step, gradi walk)