Definition
Filacium is a Latin term of medieval legal origin denoting a file — specifically, the physical thread, wire, or string upon which written documents such as writs, pleadings, and court papers were strung for preservation and official record-keeping. In historical English legal practice, documents placed upon the filacium were considered formally received and entered into the court's record. The act of filing a document was therefore understood literally: the paper was affixed to the thread.
Why It Matters in Research
Researchers working with medieval and early modern English legal sources — plea rolls, Year Books, Chancery records, and common law court materials — will encounter filacium as the technical term for what modern practice calls a court file. The significance is not merely terminological. Understanding that filing was a physical act of threading documents helps researchers interpret procedural references in historical sources: when a record states that a writ was placed on the filacium, it signals formal receipt and entry into the court's official record, with the procedural consequences that entailed.
The term appears infrequently outside Latin-language legal records and glossaries. Researchers consulting English-language abridgements or digests from the seventeenth century onward will more commonly find the anglicized form "file" or the Latin-French hybrid "filace." Burrill cross-references Spelman, making Sir Henry Spelman's Glossarium Archaiologicum the natural next stop for researchers seeking fuller treatment in a historical lexicographical source. The transition from filacium to the vernacular "file" tracks a broader shift in English legal record language and is worth noting when dating or contextualizing documents.
Historical Dictionary Support
Burrill's Law Dictionary provides the entirety of the standard historical lexicographical record on this term in accessible form, defining filacium simply as "a file" and attributing the usage to Spelman. Burrill correctly notes the French intermediate form filace, reflecting the term's passage through Anglo-Norman legal vocabulary before its Latin form was regularized in learned record-keeping. The entry's brevity is itself informative: by the time of Burrill's compilation, filacium had receded so thoroughly into historical and antiquarian usage that extended treatment was unnecessary. No substantive divergence exists among historical sources on its meaning — the term is unambiguous. What the historical dictionaries collectively omit is any sustained treatment of the procedural significance of the filacium in court practice, for which researchers must turn to histories of English legal procedure and record-keeping rather than the dictionaries themselves.