What is the meaning of retrograde?

verb

• Move backward in an orbit, of celestial bodies.
• Move in a direction contrary to the usual one.
  • usage: "retrograding planets"
• Move back.
  • usage: "The glacier retrogrades"
  • synonyms: retreat
• Go back over.
  • usage: "retrograde arguments"
  • synonyms: rehash, hash over
• Get worse or fall back to a previous condition.
  • synonyms: regress, retrogress

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.
  • synonyms: retrogressive
• Moving or directed or tending in a backward direction or contrary to a previous direction.
  • synonyms: retral