Muniment of title is documented evidence of title of ownership of something. It is usually used in transactions such as sales and inheritances. In state probate law, which varies by state, it may be a procedure used in place of a full administration of the estate. Under muniment of title, no executor or administrator is appointed, instead, the court can admit the will to probate as a muniment of title or record of title. Typically, a muniment of title application may only be used when there are no unpaid debts (other than those secured by real estate) and the court finds that a full administration of the estate is unnecessary. An order from the judge, admitting a will to probate as a muniment of title, puts on record the transfer of ownership of the property. This alternative is often used when a number of years have passed since the date of the decedent's death, and no regular probate is possible.
https://definitions.uslegal.com/m/muniment-of-title/