retrograde

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retrograde (astron., of planets) moving apparently in a direction contrary to the order of the signs XIV; tending or inclined to go backwards XVI. — L. retrōgradus, f. RETRO- + gradus step.
So vb. XVI. — L. retrōgradī, later retrōgradāre. retrogradation XVI. — late L. Hence retrogression XVII.

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