[v. ri-gres; n. ree-gres]
verb (used without object)
to move backward; go back.
to revert to an earlier or less advanced state or form.
the act of going back; return.
the right to go back.
backward movement or course; retrogression.

1325–75; Middle English regresse (noun) < Latin regressus a returning, going back, equivalent to re- re- + -gred-, combining form of gradī to step, walk, go + -tus suffix of v. action, with dt > ss

regressor, noun

1. revert, retreat, backslide, lapse, ebb. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  (intr) to return or revert, as to a former place, condition, or mode of behaviour
2.  (tr) statistics to measure the extent to which (a dependent variable) is associated with one or more independent variables
3.  the act of regressing
4.  movement in a backward direction; retrogression
5.  logic a supposed explanation each stage of which requires to be similarly explained, as saying that knowledge requires a justification in terms of propositions themselves known to be true
[C14: from Latin regressus a retreat, from regredī to go back, from re- + gradī to go]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c. (n.), "act of going back," from L. regressus "a return," from regress-, pp. stem of regredi "to go back," from re- "back" + gradi "to step, walk" (see grade). The verb meaning "to move backward" is recorded from 1823; the psychological sense of "to return to an earlier
stage of life" is attested from 1926. Regressive is recorded from 1630s; in ref. to taxation, it is attested from 1889.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Its vision of modernity reflects not progress but regress.
For some of these students, they regress to behaviors that worked for them when
  they wanted something from their parents.
What these amateur statisticians have in fact done, is regress two positive
  trends on each other.
Here it is on the cusp of disappearing into an infinite regress.
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