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4 definitions found
 for regression
From The Collaborative International Dictionary of English v.0.48 :

  Regression \Re*gres"sion\ (r?*gr?sh"?n), n. [L. regressio: cf.
     F. r['e]gression.]
     The act of passing back or returning; retrogression;
     retrogradation. --Sir T. Browne.
     [1913 Webster]
  
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  regression
      n 1: an abnormal state in which development has stopped
           prematurely [syn: arrested development, fixation,
           infantile fixation, regression]
      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: regression, simple
         regression, regression toward the mean, statistical
         regression]
      4: returning to a former state [syn: regression, regress,
         reversion, retrogression, retroversion]

From Moby Thesaurus II by Grady Ward, 1.0 :

  135 Moby Thesaurus words for "regression":
     Brownian movement, Freudian fixation, about-face, advance,
     angular motion, arrested development, ascending, ascent, atavism,
     axial motion, backflowing, backing, backset, backsliding,
     backward deviation, backward motion, career, climbing, comedown,
     course, current, debasement, decadence, decadency, declension,
     declination, decline, deformation, degeneracy, degenerateness,
     degeneration, degradation, demotion, depravation, depravedness,
     depreciation, derogation, descending, descent, deterioration,
     devolution, disenchantment, downtrend, downturn, downward mobility,
     downward motion, downward trend, drift, driftage, drop, dying, ebb,
     ebbing, effeteness, fading, failing, failure, failure of nerve,
     fall, falling back, falling-off, father fixation, fixation, flight,
     flip-flop, flow, flux, forward motion, infantile fixation,
     involution, lapse, libido fixation, loss of tone, mother fixation,
     mounting, oblique motion, ongoing, onrush, parent fixation,
     passage, plunging, pregenital fixation, progress, radial motion,
     random motion, recidivation, recidivism, reclamation, reconversion,
     recrudescence, recurrence, reflowing, refluence, reflux, regress,
     rehabilitation, reinstatement, relapse, renewal, restitution,
     restoration, retreat to immaturity, retrocession, retrogradation,
     retrogression, retroversion, return, returning, reversal, reverse,
     reversion, reverting, revulsion, rising, run, rush, set, setback,
     sideward motion, sinking, slippage, slipping back, slump, soaring,
     sternway, stream, subsiding, throwback, traject, trajet, trend,
     turn, turnabout, upward motion, wane
  
  

From The Free On-line Dictionary of Computing (30 December 2018) :

  regression
  
     1.  A mathematical method where an empirical
     function is derived from a set of experimental data.
  
     2. regression testing.
  
     (1995-03-14)
  

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