noun
1.
a return to an ancestral type or condition or an instance of such a return
the law was a shocking reversion to earlier times
Synonyms: atavism, throwback
Related Word: backsliding, lapse, relapse
Contrasted words: advance, amendment, bettering, betterment, improvement; reform
2.
Synonyms: reversal 1, about-face, changeabout, reverse, reversement, right-about, right-about-face, turn, turnabout, volte-face