In the law of domestic relations, an anulment is to be distinguished from a divorce, in that a divorce is the termination, dissolution or suspension of a previously existing valid marriage; usually for some cause arising after the marriage, whereas an annulment is a court decree proclaiming that an obstensibly legal marital relationship is stripped of its color of legality, and declared void ab initio, for some reason existing at the time of the marriage
John R. Tomlinson,
Annulment Under the Washington Divorce Act of 1949,
30 Wash. L. Rev. & St. B.J.
Available at: https://digitalcommons.law.uw.edu/wlr/vol30/iss1/6