(Greek: up, upward; back, backward, against; again, anew; used as a prefix)

(Greek: backward; behind, at the back, after, posterior)

(Greek > Latin: recurrence, repetitious; back, backward, again; returning, repeating)

(Latin: back, backward, again; used as a prefix)

(Latin: back, backward, backwards; behind)

(Latin: reciprocus, turning back the same way, alternating; turning backward and forward; to give, to do, to feel, or to show in return)