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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI