reversion

A return to a former condition, belief, or interest.

A turning away or in the opposite direction; a reversal.

A return to the normal phenotype, usually by a second mutation.

The return of an estate to the grantor or to the grantor’s heirs or successor after the grant has expired.

The estate thus returned.

The right to succeed to such an estate.

The act of reverting or returning to a former position, state, frame of mind, subject, etc.; return; recurrence.

In biology: Return to some ancestral type or plan; exhibition of ancestral characters; atavism; specifically, in botany, the conversion of organs proper to the summit or center of the floral axis into those which belong lower down, as stamens into petals, etc. Also reversal.

Return to the wild or feral state after domestication; exhibition of feral or natural characters after these have been artificially modified or lost.