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RET'ROGRADE, adjective [Latin retrogradior; retro, backwards, and gradior, to go.]

1. Going or moving backwards.

2. In astronomy, apparently moving backward and contrary to the succession of the signs, as a planet.

3. Declining from a better to a worse state.

RET'ROGRADE, verb intransitive [Latin retrogradior; retro and gradior, to go.]

To go or move backward.