Dissolution of marriage is filed when two people who have been legally married, and one or both of them goes through the court process to have the marriage ended.Dissolution is the formal, legal ending of a marriage by a court, commonly called a divorce. A dissolution of marriage completely ends your legal relationship as spouses and ends your marriage. Unlike an annulment, a dissolution does not “undo" the marriage as if it never existed.A Petition for Dissolution of Marriage is a type of court document that is used for initiating a divorce proceeding. The petition lets one spouse inform the other that they seek a divorce or dissolution of the marriage. It also informs the courts of potential issues that might be a factor in the divorce proceedings, such as spousal support, child custody, and other factors.