Yours, Etc.: Origins and Uses of 8 Sign-Offs
c.1300, "to come to oneself again," from Old French revertir "return, change back," from Vulgar Latin *revertire, variant of Latin revertere "turn back, turn about; come back, return," from re- "back" (see re-) + vertere "to turn" (see versus). Of position or property from mid-15c.; application to customs and ideas is from 1610s.
revert re·vert (rĭ-vûrt')
v. re·vert·ed, re·vert·ing, re·verts
To return to a former condition, practice, subject, or belief.
To undergo genetic reversion.