retrogradation noun. [,rɛtrǝʊgrǝ'deɪʃ(ǝ)n] M16.
[Late Latin retrogradatio(n-): see RETRO-, GRADATION.]
1. Astronomy & Astrology. Retrograde motion, esp. that of a superior planet close to opposition. Opp. progression. M16.
b. The backward movement of the lunar nodes on the ecliptic. Now rare or obsolete. E18.

2. The action or an act of going back towards some point in investigation or reasoning. L16.

3. The action or fact of moving back or backwards; retirement, retreat; fig. falling back in development, retrogression, decline; an instance of this, a retrograde step. L16.
b. Physical Geography. The landward retreat of a beach or coastline caused by wave erosion. E20.

[TahlilGaran] English Dictionary ▲