different between regrade vs regrede

English

re- +? grade

regrade (third-person singular simple present regrades, present participle regrading, simple past and past participle regraded)

(transitive) To grade again, give a new grade or grading to.
(transitive) To regroup or reassign.
(US, transitive) To change the classification of (potentially secret documentation).
(obsolete) To retire or recede.

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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