re·gres·sion /rɪˈgrɛʃən/
  回歸復原,逆行,退步
  re·gres·sion /rɪˈgrɛʃən/ 名詞
  退化,退行,回歸
  regression
  迴歸
  Re·gres·sion n.  The act of passing back or returning; retrogression; retrogradation.
  Edge of regression (of a surface) Geom., the line along which a surface turns back upon itself; -- called also a cuspidal edge.
  Regression point Geom., a cusp.
  ◄ ►
  regression
       n 1: an abnormal state in which development has stopped
            prematurely [syn: arrested development, fixation, infantile
            fixation]
       2: (psychiatry) a defense mechanism in which you flee from
          reality by assuming a more infantile state
       3: the relation between selected values of x and observed
          values of y (from which the most probable value of y can
          be predicted for any value of x) [syn: simple regression,
           regression toward the mean, statistical regression]
       4: returning to a former state [syn: regress, reversion, retrogression,
           retroversion]