/ Dictionary / Index R retrogradation: Meaning and Definition of Find definitions for: ret•ro•gra•da•tion Pronunciation: (re"trō-grā-dā'shun), [key] — n. backward movement. decline or deterioration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. retrofocus lens retrograde Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language