n. Astron. 1 the apparent backward motion of a planet in the zodiac. 2 the apparent motion of a celestial body from east to west. 3 backward movement of the lunar nodes on the ecliptic. [LL retrogradatio (as RETRO-, GRADATION)]
RETROGRADATION
Meaning of RETROGRADATION in English
English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012