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regress (n.)

late 14c., regresse, "a return, passage back, act of going back," from Latin regressus "a return, retreat, a going back," noun use of past participle of regredi "to go back," from re- "back" (see re-) + gradi "to step, walk" (from PIE root *ghredh- "to walk, go"). More common in legal language. Mental sense of "act of working back from an effect to a cause" is from 1610s.

regress (v.)

1550s, "to return to a former state or place, go back," from Latin regressus "a return, retreat, a going back," noun use of past participle of regredi "to go back," from re- "back" (see re-) + gradi "to step, walk" (from PIE root *ghredh- "to walk, go").

In astronomy, "appear to move in a backward direction," by 1823. The psychological sense of "to return to an earlier stage of life" is attested from 1926. Related: Regressed; regressing.

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Definitions of regress from WordNet
1
regress (v.)
go back to a statistical means;
regress (v.)
go back to a previous state;
Synonyms: revert / return / retrovert / turn back
regress (v.)
get worse or fall back to a previous condition;
Synonyms: retrograde / retrogress
regress (v.)
go back to bad behavior;
Synonyms: relapse / lapse / recidivate / retrogress / fall back
2
regress (n.)
the reasoning involved when you assume the conclusion is true and reason backward to the evidence;
Synonyms: reasoning backward
regress (n.)
returning to a former state;
From wordnet.princeton.edu