An Etymological Dictionary of Astronomy and Astrophysics

1. To take back or withdraw; annul, cancel, or reverse; rescind or repeal.
   

2. To bring or summon back (Dictionary.com).

Etymology (EN): M.E., from O.Fr. revoquer, from L. revocare “rescind, call back,” from → re- “back,” + vocare “to call,” from vox, → voice.

Etymology (PE): Vâvacidan, from vâ-, → re-, + vacidan “to call,” → convoke.