Matrimony Definition: The legal state of being married. The legal state of being married. Ecclesiastics talk of the "holy" state of matrimony. In popular culture, Gilbert O'Sullivan's song "Matrimony" refers to this legal term: "You and me are all that matters Disregard the rest Trust your soon to be old man,he knows what is best Very shortly now there's going to be an answer from you then one from me That's matrimony Marriage - the joining together of the two people For better or for worse, 'til death them do part." Categories & Topics: Family Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!