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.

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OXFORD DICTIONARY

regression, n.
1 a backward movement, esp. a return to a former state.
2 a relapse or reversion.
3 Psychol. a return to an earlier stage of development, esp. through hypnosis or mental illness.
4 Statistics a measure of the relation between the mean value of one variable (e.g. output) and corresponding values of other variables (e.g. time and cost).

Etymology

L regressio (as REGRESS)

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THESAURUS

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

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ROGET THESAURUS

regression

Reversion

N reversion, return, revulsion, turning point, turn of the tide, status quo ante bellum, calm before a storm, alternation, inversion, recoil, retreat, regression, retrogression, restoration, relapse, recidivism, atavism, vicinism, reverting, regressive, revulsive, reactionary, retrorse, a rebours.

Regression

N regress, regression, retrocession, retrogression, retrograduation, retroaction, reculade, retreat, withdrawal, retirement, remigration, recession, recess, crab-like motion, refluence, reflux, backwater, regurgitation, ebb, return, resilience reflection, reflexion (recoil), flip-flop, volte-face, counter motion, retrograde motion, backward movement, motion in reverse, counter movement, counter march, veering, tergiversation, recidivation, backsliding, fall, deterioration, recidivism, recidivity, reversal, relapse, turning point, receding, retrograde, retrogressive, regressive, refluent, reflex, recidivous, resilient, crab-like, balky, reactionary, back, backwards, reflexively, to the right about, a reculons, a rebours, revenons a nos moutons, as you were.

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