Etymology
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retrograde (adj.)

late 14c., of planets, "appearing to move in the sky contrary to the usual direction," from Latin retrogradus "going back, moving backward," from retrogradi "move backward," from retro "backward, reverse" (see retro-) + gradi "to go, step" (from PIE root *ghredh- "to walk, go"). General sense of "tending to revert" is recorded from 1530s; that of "directed backward, in a direction contrary to the original motion" is from 1620s. .

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Definitions of retrograde
1
retrograde (v.)
move backward in an orbit, of celestial bodies;
retrograde (v.)
move in a direction contrary to the usual one;
retrograde (v.)
move back;
The glacier retrogrades
Synonyms: retreat
retrograde (v.)
go back over;
retrograde arguments
Synonyms: rehash / hash over
retrograde (v.)
get worse or fall back to a previous condition;
Synonyms: regress / retrogress
2
retrograde (adj.)
moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth;
retrograde (adj.)
of amnesia; affecting time immediately preceding trauma;
retrograde (adj.)
going from better to worse;
Synonyms: retrogressive
retrograde (adj.)
moving or directed or tending in a backward direction or contrary to a previous direction;
Synonyms: retral
From wordnet.princeton.edu