Artificial intelligent assistant

retrogation

retrogation
  erroneous f. retrogradation.

1646 Game at Sc. & Eng. 6 Whereby you would..utterly debar them in this difference from all retrogations beyond the Covenant. 1708 Brit. Apollo No. 85. 2/1 Stations and Retrogations of the Planets.

Oxford English Dictionary

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