To Revert

1. (transitive, now rare) To turn back, or turn to the contrary; to reverse.
2. To throw back; to reflect; to reverberate.
3. (transitive) To cause to return to a former condition.
4. (intransitive, now rare) To return; to come back.
5. When a book goes out of print, rights revert from the publisher to the author.

• (intransitive, law) Of an estate: To return to its former owner, or to his or her heirs, when a grant comes to an end.

7. (transitive) To cause (a property or rights) to return to the previous owner.
8. (intransitive) To return to a former practice, condition, belief, etc.
9. (intransitive, biology) To return to an earlier or primitive type or state; to take on the traits or characters of an ancestral type.
10. (intransitive) To change back, as from a soluble to an insoluble state or the reverse.
11. Phosphoric acid in certain fertilizers reverts.
12. (intransitive) To take up again or return to a previous topic(intransitive, in Muslim usage, due to the belief that all people are born Muslim) To convert to Islam. (intransitive, nonstandard, proscribed, originally India, now also Singapore, Malaysia, Hong Kong) To reply (to correspondence, for example).
13. (transitive, mathematics) To treat (a series, such as y = a + bx + cx2 + ..., where one variable y is expressed in powers of a second variable x), so as to find the second variable x expressed in a series arranged in powers of y.