Definition
A Latin term from old English legal practice meaning "moved," "stirred," or "set in motion." Motum appears most commonly as a participial modifier in procedural phrases, where it describes an action or proceeding that has been commenced or formally initiated. Its primary recorded use is in the phrase *placitum motum* — a plea moved or a suit commenced — indicating that a legal proceeding had been formally put into motion before a court.
Why It Matters in Research
Motum is a term a researcher will encounter in medieval and early modern English legal records and Latin pleading texts rather than in modern case law or statutes. Its significance is almost entirely contextual: the word signals procedural commencement, and understanding it is essential to reading pleading records, court rolls, and treatises from the Fleta period (late 13th to 14th century) forward.
Researchers working in Year Books, plea rolls, or early common law treatises should treat motum as a flag for the initiation of proceedings. When a plea is described as *motum*, the document is marking a jurisdictional or temporal threshold — that the litigation is underway, not merely contemplated. This distinction mattered procedurally, affecting questions of jurisdiction, timing, and the availability of certain defenses or writs.
Because motum is a participle rather than a standalone legal noun, it will rarely appear as a standalone index entry in historical sources. Researchers should search instead for the phrases in which it is embedded — chiefly *placitum motum* — and look to the surrounding procedural context. The term is unlikely to appear in post-17th-century English or American legal materials with any frequency; its shelf life is substantially confined to the Latin pleading era.
Historical Dictionary Support
Burrill is the primary source carrying this term, and his entry is terse but sufficient for the word's limited function. He derives motum from *movere* (to move), identifies it as old English law Latin, defines it as "moved; stirred; put in motion; commenced," and anchors it with a reference to Fleta, Book 6, Chapter 23, Section 10, in the context of *placitum motum*. Burrill does not elaborate further, which reflects the word's status as a functional grammatical element rather than a substantive legal concept in its own right.
Bouvier and Black's do not carry entries for motum, suggesting that by the time those dictionaries were compiled and standardized, the term had retreated fully into the historical and antiquarian register. The absence from those sources is itself informative: it marks the practical extinction of motum as a term of live legal art in Anglo-American practice. Researchers should not expect to find doctrinal development or interpretive case law around motum; its utility is definitional and translational, not doctrinal.
The Fleta citation Burrill provides is genuine. Fleta is a late 13th-century English legal treatise, anonymous in authorship, closely related to Bracton and written during the reign of Edward I. It is a primary source for understanding procedural concepts of that era and is the natural habitat for a term like motum.