adjective

(1) Moving from east to west on the celestial sphere

(2) Or--for planets--around the sun in a direction opposite to that of the Earth

(3) Of amnesia

(4) Affecting time immediately preceding trauma

(5) Going from better to worse

(6) Moving or directed or tending in a backward direction orcontrary to a previous direction

verb

(1) Move backward in an orbit

(2) of celestial bodies

(3) Move in a direction contrary to the usual one

(4) Move back

(5) Go back over

(6) Get worse

(7) Fall back to a previous or worse condition