Definition of retrogradient in US English:

retrogradient

adjective

rare
  • Retrograde.

Origin

Late Middle English; earliest use found in John Lydgate (c1370–c1449), poet and prior of Hatfield Regis. From classical Latin retrōgradient-, retrōgradiēns, present participle of retrōgradī retrograde, in early use perhaps via Anglo-Norman retrogradient.

Pronunciation

retrogradient

/ˌrɛtrə(ʊ)ˈɡreɪdɪənt/