Noah Webster
Retrograde
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.