different between regreded vs regrede

English

regreded

From Latin regredi (“to go back”). Compare regrade, regress.

regrede (third-person singular simple present regredes, present participle regreding, simple past and past participle regreded)

(intransitive) To go back; to retrograde, as the apsis of a planet's orbit.
- 1878, The Educational Times (page 316)
  […] the instantaneous parabola decreases in magnitude and descends in position throughout the entire motion, while its axis regredes during the ascent and progredes during the descent of the particle.

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