Dictionary definition · retrograde
verb
- move backward in an orbit, of celestial bodies
- move in a direction contrary to the usual one"retrograding planets"
- move back"The glacier retrogrades"
- go back over"retrograde arguments"
- get worse or fall back to a previous condition
adjective
- moving from east to west on the celestial sphere; or — for planets — around the sun in a direction opposite to that of the Earth
- of amnesia; affecting time immediately preceding trauma
- going from better to worse
- moving or directed or tending in a backward direction or contrary to a previous direction
Source: Open English WordNet (CC BY 4.0).