Dictionary.com
definitions

regressive

[ri-gres-iv]
adjective
  1. regressing or tending to regress; retrogressive.
  2. Biology. of, relating to, or effecting regression.
  3. (of tax) decreasing proportionately with an increase in the tax base.
  4. Logic. obtained from or characterized by backward reasoning.

Origin of regressive

First recorded in 1625–35; regress + -ive
Related formsre·gres·sive·ly, adverbre·gres·sive·ness, re·gres·siv·i·ty [ree-gre-siv-i-tee] /ˌri grɛˈsɪv ɪ ti/, nounnon·re·gres·sive, adjectivenon·re·gres·sive·ly, adverbun·re·gres·sive, adjectiveun·re·gres·sive·ly, adverbun·re·gres·sive·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for non-regressive

regressive

adjective
  1. regressing or tending to regress
  2. (of a tax or tax system) levied or graduated so that the rate decreases as the amount taxed increasesSee progressive (def. 5)
  3. of, relating to, or characteristic of regression
Derived Formsregressively, adverbregressiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for non-regressive

regressive

adj.

1630s; see regress + -ive. In reference to taxation, it is attested from 1889. Related: Regressively.

Online Etymology Dictionary, © 2010 Douglas Harper
non-regressive in Medicine

regressive

[rĭ-grĕs′ĭv]
adj.
  1. Having a tendency to return or to revert.
  2. Characterized by regression.
Related formsre•gres′sive•ness n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.