Definition
A Latin phrase meaning "at length" or "in full." In historical legal practice, per extensum indicated that a document, pleading, record, or judicial act was written out in its complete and unabbreviated form, rather than in the abbreviated or summary notation common in older court records. When a clerk, court, or authority was directed to set something out per extensum, the instruction was to transcribe or reproduce the full text — every word, clause, and formula — without contraction or shorthand.
The term belonged to the procedural vocabulary of courts that maintained formal Latin records, where abbreviation was routine and completeness required an explicit signal. It appears most characteristically in admiralty practice, where pleadings and process were recorded with particular formality.
Common Language
Modern common usage (Wiktionary): No standard entry. "Extensum" derives from the Latin for "extended" or "stretched out"; the phrase is not part of contemporary general English.
Historical common usage (Webster's 1913): Not entered as a common English term. The component words would have been understood by any educated reader of Latin as meaning "in extended form" or "at length."
The phrase has no meaningful life outside legal and ecclesiastical Latin contexts. Researchers encountering it in general historical documents — rather than court records — should treat it as a signal of formal scribal or administrative practice, not a term carrying independent legal significance in those settings.
Why It Matters in Research
Per extensum appears almost exclusively in pre-modern English and English-derived court records, particularly in admiralty proceedings and ecclesiastical courts. Researchers working in early modern primary sources — original plea rolls, admiralty registers, or transcribed court books — may encounter the phrase as a directional notation rather than a substantive legal term. It tells you what format was required or used, not what the underlying legal rule was.
The main research trap is treating per extensum as a term of substantive doctrine. It is not. It is a clerical and procedural direction. Its presence in a record confirms that the material following (or referenced) is a full transcription rather than an abstract or minute entry. This distinction matters when assessing the evidentiary weight of a historical record: a per extensum transcription of a judgment or instrument carries stronger presumptive completeness than a brief entry or summary notation.
Burrill's citation to Clerke's Praxis Curiae Admiralitatis (Prax. Cur. Adm.) locates the term firmly in the admiralty context. Researchers using Law Mind materials on admiralty jurisdiction or historical court procedure should be alert to this phrase when reading original procedural manuals or their commentaries.
Because the phrase belongs to the era of Latin court records, it will rarely if ever appear in American materials after the early national period, and essentially disappears from English records following the shift to English-language pleading requirements in the nineteenth century. A researcher encountering per extensum in post-1850 materials should treat that as an anomaly warranting closer attention to the document's provenance.
Historical Dictionary Support
The three source dictionaries are in complete agreement — an unusual uniformity that itself signals the term's narrow, settled scope. All three define per extensum as "at length" in the context of old practice; none attributes any doctrinal content to it. Black's (both editions) provides no citation. Burrill alone offers a source reference, pointing to Clerke's Praxis, which locates the term specifically in admiralty pleading procedure.
The brevity of the entries across all three dictionaries is itself informative: this is not a term that generated interpretive controversy, split authority, or doctrinal development. It was a workmanlike piece of Latin procedural vocabulary, well understood by practitioners who used it, and requiring no extended treatment by lexicographers.
What the historical dictionaries do not address is the broader scribal and administrative context in which per extensum functioned. The phrase did similar work in ecclesiastical and chancery records, not only in admiralty — a dimension Burrill's source citation partially illuminates but does not fully develop.
Jurisdictional Note
Per extensum is a term of historical English practice with no recognized doctrinal role in modern American, English, or Commonwealth law. Jurisdictional variation is not a meaningful consideration; the phrase does not create enforceable rights or obligations in any contemporary system.