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regress (n.)

late 14c., "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").

regress (v.)

1550s, "to return to a former state," from Latin regressus (see regress (n.)). Meaning "to move backward" is from 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