Rē'tro-grēs'sion or Rēt'ro-grēs'sion, n.
n. [Fr. rétrogression, Lat. retrogressus, fr. retrogradi. See supra.] The act of going backward; retrogradation.
n. [Fr. rétrogression, Lat. retrogressus, fr. retrogradi. See supra.] The act of going backward; retrogradation.