annul

Etymology

From Middle English annullen, from Old French anuller, from Latin annullō (“annihilate, annul”), from ad (“to”) + nūllus (“none, not any”).

verb

1. (transitive) To formally revoke the validity of.
   If you ask how religion thus falls on the thorns and faces death, and in the very act annuls annihilation, I cannot explain the matter, for it is religion's secret, and to understand it you must yourself have been a religious man of the extremer type. 1902, William James, “Lecture 2”, in The Varieties of Religious Experience
2. (transitive) To dissolve (a marital union) on the grounds that it is not valid.