The condition of having two wives or two husbands at the same time. a marriage in which one of the parties is already legally married is bigamous, void, and ground for annulment. the one who knowingly enters into a bigamous marriage is guilty of the crime of bigamy, but it is seldom prosecuted unless it is part of a fraudulent scheme to get another’s property or some other felony. occasionally people commit bigamy accidentally, usually in the belief that a prior marriage had been dissolved. the most famous case in the united states was that of andrew jackson and his wife rachel robards. ms. robards’ husband had applied for a divorce, but it had not been granted (it required legislative approval) at the time of her second marriage. she completed the divorce and then the jacksons remarried. jackson was embarrassed for life over his carelessness (he was a lawyer and a judge), which had hurt his wife’s reputation. having several wives at the same time is called polygamy and being married to several husbands is polyandry.