Regression

n. act of moving backward; return to a previous state, retrogression

Generally, regression is related to moving backwards, and the opposite of progression. Specifically, it may refer to:Regression (psychology), a defensive reaction to some unaccepted impulsesPast life regression, (psychology) a process claiming to retrieve memories of previous livesSoftware regression, (software engineering) the appearance of a bug which was absent in a previous revisionRegression toward the mean, a common statistical phenomenonRegression analysis, a technique used in statistics and econometrics, of which examples include linear regression and nonlinear regression.Infinite regression, a problem in epistemologyTransgression (geology), a sea level rising phenomenon, the opposite of regressionRegression (medicine), a characteristic of diseases to express lighter symptoms without disappearing totally.
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Regression /re·gres·sion/ 1. return to a former or earlier state. 2. subsidence of symptoms or of a disease process. 3. [more]Regression - Community and Resources

Noun
1. an abnormal state in which development has stopped prematurely
(synonym) arrested development, fixation, infantile fixation
(hypernym) abnormality, abnormalcy, abnormal condition
2. (psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state
(hypernym) defense mechanism, defense reaction, defence mechanism, defence reaction, defense, defence
(classification) psychiatry, psychopathology, psychological medicine
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)
(synonym) simple regression, regression toward the mean, statistical regression
(hypernym) statistical method, statistical procedure
(hyponym) linear regression, rectilinear regression
(part-holonym) regression analysis
(classification) statistics
4. returning to a former state
(synonym) regress, reversion, retrogression, retroversion
(hypernym) reversal
(derivation) revert, return, retrovert, regress, turn back

n. regression, act of moving backward; return to a previous state, retrogression