(law) a document that states some contractual relationship or grants some right WordNet 3.0 & Open English WordNet

Legal instrument is a legal term of art that is used for any formally executed written document that can be formally attributed to its author, records and formally expresses a legally enforceable act, process, or contractual duty, obligation, or right, and therefore evidences that act, process, or agreement. Wikipedia

A formal documentation of a status or transaction Wikipedia Disambiguation

Regulation, part of law. Wikipedia Disambiguation

Formally executed written document Wikidata

A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will. Wiktionary

Legal document. Wiktionary (translation)