retrograde (Adjective) — (astronomy) 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 (Adjective) — Of amnesia; affecting time immediately preceding trauma.
retrograde (Adjective) — Going from better to worse.
retrograde (Adjective) — Moving or directed or tending in a backward direction or contrary to a previous direction.
retrograde (Verb) — Move backward in an orbit, of celestial bodies.
retrograde (Verb) — Move in a direction contrary to the usual one. ex. "retrograding planets"
retrograde (Verb) — Move back. ex. "The glacier retrogrades"
retrograde (Verb) — Go back over. ex. "retrograde arguments"
retrograde (Verb) — Get worse or fall back to a previous condition.