Common-law marriage, also known as non-ceremonial marriage, sui iuris marriage, informal marriage, de facto marriage, more uxorio or marriage by habit and repute, is a marriage that results from the parties' agreement to consider themselves married, followed by cohabitation, rather than through a statutorily defined process. Not all jurisdictions permit common law marriage, but will typically respect the validity of such a marriage lawfully entered into in another state or country.
The original concept of a "common-law" marriage is one considered valid by both partners, but not formally recorded with a state or religious registry, nor celebrated in a formal civil or religious service. In effect, the act of the couple representing themselves to others as being married and organizing their relationship as if they were married, means they are married.