Wordnet 3.0
ADVERB (1)
1. 
 at or to or toward the back or rear; 
- Example: "he moved back"- Example: "tripped when he stepped backward"- Example: "she looked rearward out the window of the car"[syn: back, backward, backwards, rearward, rearwards]
WordNet (r) 3.0 (2006):
rearwards
    adv 1: at or to or toward the back or rear; "he moved back";
           "tripped when he stepped backward"; "she looked rearward
           out the window of the car" [syn: back, backward,
           backwards, rearward, rearwards] [ant: forrad,
           forrard, forward, forwards, frontward,
           frontwards]