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retrogradation

[re-troh-grey-dey-shuh n] /ˌrɛ troʊ greɪˈdeɪ ʃən/
noun
1.
backward movement.
2.
decline or deterioration.
Origin
1545-1555
1545-55; < Late Latin retrōgradātiōn- (stem of retrōgradātiō), probably equivalent to Latin retrōgrad(us) retrograde + -ātiō -ation, as translation of Greek anapodismós
Related forms
retrogradatory
[re-truh-grey-duh-tawr-ee, -tohr-ee] /ˌrɛ trəˈgreɪ dəˌtɔr i, -ˌtoʊr i/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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