Divorce (or the dissolution of marriage) is the final termination of a marital union, canceling the legal duties and responsibilities of marriage and dissolving the bonds of matrimony between the parties.
Colonel Jack O'Neill was divorced from his wife, Sara O'Neill. (SG1: "Children of the Gods")
Major John Sheppard was also divorced from his wife, Nancy. (SGA: "Outcast")
Richard Woolsey was also married and lost his Yorkie in the divorce. (SGA: "Broken Ties")
The Jaffa on Chulak also have a divorce like proceeding called a 'pledge break'. If a dispute cannot be resolved, it is requested by one and granted by the other. If that fails, a weapon is required. (SG1: "Affinity")