UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌretrəʊˈgreʃən/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˌrɛtrəˈgrɛʃən/ ,USA pronunciation: respelling(re′trə greshən)

WordReference Random House Unabridged Dictionary of American English © 2020
ret•ro•gres•sion  (re′trə greshən),USA pronunciation n. 
  1. the act of retrogressing;
    movement backward.
  2. Developmental Biology, Pathology[Biol.]degeneration;
    retrograde metamorphosis;
    passing from a more complex to a simpler structure.
  • Latin retrōgress(us) (see retrogress) + -ion
  • 1640–50

WordReference Random House Learner's Dictionary of American English © 2020
ret•ro•gress /ˌrɛtrəˈgrɛs, ˈrɛtrəˌgrɛs/USA pronunciation   v. [no object]
  1. Psychiatryto go backward:Society retrogressed as learning stagnated.
ret•ro•gres•sion /ˌrɛtrəˈgrɛʃən/USA pronunciation  n. [uncountable]See -gress-.

WordReference Random House Unabridged Dictionary of American English © 2020
ret•ro•gress  (re′trə gres, retrə gres′),USA pronunciation v.i. 
  1. Psychiatryto go backward into an earlier and usually worse condition:to retrogress to infantilism.
  2. to move backward.
  • Latin retrōgressus past participle of retrōgradī to go back or backward, equivalent. to retrō- retro- + gred-, combining form of gradī to step, go (see grade) + -tus past participle suffix, with dtss
  • 1810–20
    • 1.See corresponding entry in Unabridged decline, degenerate, retrograde, withdraw, retreat, revert.

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